ºÚÁÏרÇø

Publications

• Charles, Mehdi; Dauzère-Pérès, Stéphane, Kedad-Sidhoum, Safia & Mazhoud, Issam (2025)
  Parallelized decomposition approaches for capacitated lot-sizing problems: application to the problem with constraints on ending inventories
  International Journal of Production Research, p. 21-21. Doi:
• Qiu, Kejun; Chen, Lu & Dauzère-Pérès, Stéphane (2025)
  Robust optimization approach for the resource-constrained project scheduling problem with uncertain activity release times
  Computers & Operations Research, 184, p. 107215-107215. Doi:
• Mustafee, Navonil; Harper, Alison, Viana, Joe & Monks, Thomas (2025)
  A Maturity Model for Digital Twins in Healthcare
  Winter simulation conference : proceedings. Doi:
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  Digital models, digital shadows, and digital twins (DTs) are increasingly used in manufacturing/Industry 4.0 to represent levels of integration between physical systems and their digital counterparts; data-flow mechanisms are the enablers of such integration. Healthcare operations management has also witnessed rising interest in hybrid models that use real-time data to increase situational awareness (SA) and enable short-term decision-making. In M&S literature, such models are referred to as Real-time Simulations (RtS) and DTs. Healthcare organizations can realize a heightened state of SA by transitioning from conventional modeling to RtS/DTs. The paper presents a Maturity Model for DTs to contextualize the increasing levels of healthcare Information Systems/Information Technology (IS/IT) integration with real-time models that such a shift will necessitate. The higher the Maturity Level of IS/IT integration, the greater the opportunity to develop modeling artifacts that realize the potential of real-time data and enable organizations to attain higher levels of SA.

• Lara, Juan Manuel Garcia; Osma, Beatriz Garcia, Gazizova, Irina & Khalilov, Akram (2025)
  Demand-driven Corporate Social Responsibility: Symbolic versus Substantive Change after Environmental Disasters
  Journal of Corporate Finance, 94. Doi:
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  We examine disasters caused by individual firms with severe environmental impacts. These disasters trigger industry-wide demand for corporate social responsibility (CSR). We analyze whether affected firms respond by adopting substantive or symbolic CSR measures. We find that firms increase overall CSR performance through improvements in diversity and human rights rather than decreasing environmental concerns. This suggests firms prioritize symbolic CSR to legitimize their operations rather than substantive measures to mitigate environmental harm. We also document diverging costs and welfare effects. On average, substantive CSR actions are costlier and cause lower margins but avoid divestments by ESG-oriented funds while improving long-term credit ratings. Some of these benefits of substantive actions also accrue through symbolic actions at a lower cost.

• Jambor, Elisabeth; Viana, Joe, Reuter-Oppermann, Melanie & Müller-Polyzou, Ralf (2025)
  Evaluating the impact of COVID-19 protection measures and staff absence on radiotherapy practice: A simulation study
  PLOS ONE, 20(1). Doi:
• Khalilov, Akram (2025)
  Informational and cushioning properties of conservative balance sheets: a study of crises resilience
  Review of Quantitative Finance and Accounting. Doi:
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  This study examines the informational and cushioning properties of balance sheet conservatism (BSC) and their role in mitigating the adverse effects of financial crises. I document that, due to informational property, high-BSC firms raise more debt and have a lower cost of debt financing during the crisis. The cushioning property of BSC is associated with lower earnings volatility, likelihood of significant asset write-downs and probability of covenant violations. These properties contribute to superior performance, including smaller declines in stock prices, investment, employment, and productivity. An out-of-sample test using the setting of the Great Depression (1929–1933) confirms the aforementioned findings. Overall, a path analysis suggests that BSC effects operate mostly through cushioning (informational) property contributing 39% (11%) to overall firms’ performance during the crisis.

• Viana, Joe; Vasilakis, Christos & Stylianou, Neophytos (2025)
  Leveraging quality improvement initiatives to support development of decision support tools in healthcare
  Health Systems. Doi:
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  Modelling and simulation studies have been used to inform the choices and development of quality improvement (QI) initiatives in health care, for example, by helping refine the intervention to be implemented or support decisions around the management of demand and capacity. We do not know whether a modelling study can itself be informed by a QI project and what are the associated benefits and challenges. In this research, we sought to investigate the opportunities and challenges associated with an ongoing health service-led QI project in informing the development of a stochastic simulation-based decision support tool to inform decisions around the commissioning of anticoagulation services for patients with atrial fibrillation. We found that the positive synergies offered by the QI project included good access to stakeholders and envisaged end users, co-producing relevant and impactful scenarios for experimentation, as well as access to good quality individual patient level data. On the other hand, substantial effort was required to populate input parameters with values that pertain to the natural history of the disease and the effectiveness of the different treatments. Our findings indicate that, if stakeholders require modelling results to inform aspects of a QI project, upfront investment is needed to ensure timely interaction between the two studies.

• Landrø, Karsten & Knardal, Per Ståle (2025)
  Foreldremedvirkning i kulturskolen. Samproduksjon i praksis
  Journal for Research in Arts and Sports Education, 9(1), p. 22-42. Doi:
• Hope, Ole-Kristian; Lu, Haihao & Peng, Songlan (2025)
  Economic Consequences of AS 18: Related-Party Transactions with Principals versus Nonprincipals
  Accounting Review, 100(1), p. 317-351. Doi:
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  In 2014, the PCAOB adopted a new auditing standard, AS 18 Related Parties, with the intention of enhancing auditors’ performance in auditing related-party transactions (RPTs). Using hand-collected data, we find significant reductions in both firms’ restatement risk and their engagement in RPTs following the AS 18 adoption. Such reductions are especially pronounced for smaller firms and firms having RPTs with principals, in which related persons in the counterparty of RPTs are the primary beneficiaries, such as CEOs, board chairs, or primary shareholders. We also find that smaller firms having RPTs with principals tend to pay higher audit fees post-AS 18. Our study responds to the PCAOB’s call to assess the economic consequences of AS 18. The findings suggest that AS 18 is associated with improved audit quality and reductions in auditees’ opportunistic RPT activities.

• Khalilov, Akram & Witter, Tobias (2025)
  Bridging the gap: A study of government suppliers' reporting practices
  Journal of Accounting and Public Policy. Doi:
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  Using 4 million procurement contracts valued at around $1 trillion, we examine the financial reporting quality of government suppliers. We document that government suppliers demonstrate higher-quality financial reporting than do firms without government contracts. This finding is partly attributable to improvements in firms' internal controls over financial reporting following contracting with the government. Additionally, we document that procurement contract clauses related to competitive procedures, government monitoring, and certification of internal information accuracy contribute to the quality of financial reporting. We address potential endogeneity concerns by studying changes in congressional committee leadership and performing difference-in-differences analyses around first- and last-time contract awards. Our findings highlight the role of government customers in enhancing the quality of mandatory disclosures and internal controls.

• Khalilov, Akram; Gazizova, Irina & Osma, Beatriz Garcia (2025)
  Directors' Bankruptcy Experience and Financial Reporting Choices
  Journal of Business Finance & Accounting, 52(3), p. 1631-1665. Doi:
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  We identify directors who experience a corporate bankruptcy and examine how this professional experience affects monitoring at the other firms where they concurrently sit on the board. Using a sample of US directors interlocked with firms that file for bankruptcy, we find that directors have a greater tolerance for real earnings management after a low-cost bankruptcy experience. This effect is stronger for independent directors and those who sit on the audit committee, consistent with a ratification and monitoring explanation. We do not find evidence consistent with the competing hypotheses that bankruptcy leads to directors' distraction or incentivizes efficient cost-cutting strategies. We contribute to the research on the influence of directors' corporate experience over corporate outcomes, by providing evidence suggesting that surviving a bankruptcy relatively unscathed lowers directors' perception of the severity of distress costs, with negative consequences for decision control.

• Huemer, Lars & Flygansvær, Bente Merete (2025)
  Increasing circularity: The importance of resource interactions when adapting from waste management to resource management
  Industrial Marketing Management, 125, p. 118-130. Doi:
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  The circular economy, which entails a fundamental transition from waste management to resource management, involves waste minimization and prolonged resource utility. Resources should arguably be managed in a manner reducing the likelihood that they turn into waste. Correspondingly, waste should be managed in a way increasing the likelihood that it becomes a useful resource. To achieve such ends, this research highlights the bundled nature of resources (including waste). The study is based on an abductive research process and it de-bundles the resource categories portrayed in the 4R model. The de-bundled framework is applied to a longitudinal case study focusing on a recycling company's participation in the circular economy. This application results in distinctions between endogenous and exogenous adaptation strategies. Endogenous adaptations involve an explicit bundle awareness and attention to interaction processes within 4R resource categories, exogenous adaptations include interaction processes between 4R categories. It is proposed that adaptations involving deliberate tradeoffs between endogenous and exogenous strategies may lead to more circular business models and sustainable resource management.

• Correia-Duarte, Pedro Josè; Dauzère-Pérès, Stéphane, Huisman, Dennis, Mannino, Carlo, Sartor, Giorgio, Weik, Norman & Widmann, Philipp (2025)
  50 years of OR in railway timetabling and rolling stock planning
  EURO Journal on Transportation and Logistics, 14. Doi:
• Seo, Jiwoo; Ding, Wenhong, Ke, Yun & Shi, Zhenyang (2025)
  How do investors perceive firms’ hiring of local CEOs? Evidence from the cost of equity capital
  The British Accounting Review. Doi:
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  According to Yonker (2017a), the U.S. executive labor market shows a striking “hiring home bias” in that firms are more likely to hire local CEOs (i.e., CEOs from their own states). We explore how investors perceive such hiring practices by examining whether they demand different costs of equity capital from firms led by local versus non-local CEOs. Our empirical evidence suggests that, on average, investors perceive hiring local CEOs positively by demanding lower costs of equity capital. The finding holds up to a battery of robustness tests. Cross-sectional tests show that the effect is more pronounced in firms that are more locally based, when firms potentially receive more local monitoring, when firms issue more earnings forecasts, and when firms have strong corporate governance. In addition, the level of social capital in the state where a firm is located attenuates the negative relation. Overall, we find evidence consistent with the notion that capital market participants price CEOs’ geographic characteristics and provide implications to the boards of directors on CEO-firm matches.

• Bø, Eirill & Baxter, John (2025)
  Sustainability of the Collection of ºÚÁÏרÇø Household Waste
  Logistics, 9(1). Doi:
• Melaku, Tsegaye; Mekonnen, Zeleke, Tucho, Gudina Terefe, Viana, Joe, Årdal, Christine Oline & Jahre, Marianne (2025)
  Resilience and Adaptability in Paracetamol Supply Chains: A Systems Perspective on COVID-19 Challenges and Responses in Ethiopia
  Logistics, 9(1). Doi:
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  Background: The COVID-19 pandemic exposed vulnerabilities in global supply chains, including those for essential medicines like paracetamol. This study aimed to assess the resilience and adaptability of Ethiopia’s paracetamol supply chain during the pandemic. Methods: A mixed-methods approach was employed, combining semi-structured interviews with key stakeholders and analysis of secondary data on paracetamol availability and supply chain disruptions. The study employed systems thinking and supply chain resilience frameworks, utilizing causal loop diagrams to visualize system dynamics. Results: Eighteen stakeholders, representing seven pharmaceutical manufacturers, five import companies, and five wholesalers, participated in the study. These participants had between three and fourteen years of experience in their respective roles. The study revealed complex interactions within the paracetamol supply chain, highlighting both challenges and adaptive responses. While 500 mg paracetamol tablets were readily available, shortages of other formulations were observed due to a range of factors, including limited product diversification, political instability, inflation, and reduced production efficiency. Conclusions: The resilience and adaptability of stakeholders, particularly manufacturers and importers, were crucial in maintaining the supply of 500 mg paracetamol tablets. Key strategies included regional sourcing, increased production, and improved partnerships. Understanding the interconnectedness of factors within the supply chain is essential for developing effective strategies to enhance its resilience and ensure sustained access to paracetamol in the future.

• Bø, Eirill & Flygansvær, Bente Merete (2025)
  A triple-bottom-line evaluation of municipal solid waste collection
  Sustainable Futures, 10. Doi:
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  Municipal Solid Waste (MSW) collection systems can contribute to a sustainable society by transforming waste to valuable resources. However, if not properly designed, the MSW collection systems can become a liability in terms of high cost, high emissions and reduced service. There is still a lack of knowledge on how MSW collection system designs trade off the elements in the triple bottom line. The purpose of this study is to contribute to such understanding. A service-mix framework is proposed, demonstrating trade-offs among the decision areas of bin types, vehicle types, pick-up frequency, delivery distance, co-collection, and sorting in MSW collection systems. The triple bottom line performance is evaluated on cost, service, and emission levels. Two MSW collection systems are analysed and compared, using an Excel-based spreadsheet model. The findings show a potential to improve sustainability in MSW collection systems by trading off service-mix components. Specifically, the findings show that if five households share bins (accept reduced convenience, and the data indicate that they do) the reduction potential is 46 % for cost and 27 % for the CO2 emissions. Similarly, reducing the pick-up frequency service reduces cost and CO2 emissions. Finally, a sensitivity analysis of fill rates shows that using dual chamber trucks gives a high risk of increased cost and CO2 emissions, due to the difficulty of matching waste volumes and chamber sizes. Thus, the paper demonstrates that significant reduction of cost and emission levels are possible without a significant sacrifice of service levels in MSW collection systems.

• Knardal, Per Ståle (2024)
  Packing and unpacking management control in major sport events
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• Lyngstadås, Hakim & Mauritzen, Johannes (2024)
  Adults in the room? The auditor and dividends in small firms: evidence from a natural experiment
  Empirical Economics. Doi:
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  We examine the effect of auditing on dividends in small private firms. We hypothesize that auditing can constrain dividends by way of promoting accounting conservatism. We use register data on private ºÚÁÏרÇø firms and random variation induced by the introduction of a policy allowing small private firms to forgo the use of an auditor to estimate the effect of auditing on dividend payout. Identification is obtained by a regression discontinuity around the arbitrary thresholds for the policy. Propensity score matching is used to create a balanced synthetic control. We consistently find that forgoing auditing led to a significant increase in dividends in small private firms.

• Absi, Nabil; Heuvel, Wilco van den & Dauzère-Pérès, Stéphane (2024)
  Complexity analysis of integrated dynamic lot sizing and maintenance planning problems
  European Journal of Operational Research, 318(1). Doi:
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  We consider a problem where the planning decisions of producing on and maintaining a single machine are integrated. The age of the machine, and thus when maintenance should be performed, is influenced by the production decisions. Decisions are taken on a planning horizon discretized in periods. The computational complexity of several variants of the single-item problem are studied depending on whether (i) Maintenance can be performed on the machine at any point in time in a period or must be performed at the end of a period, (ii) There is a fixed aging component when starting production, and (iii) There is a minimum age before maintenance can be performed on the machine. The multi-item case is proved to be NP-hard.

• Bleibtreu, Christopher; Erinc, Mert, Orozco, Luciana & Shi, Zhenyang (2024)
  Auditors and client investment efficiency: a quasi-replication and further insights from a regulatory change
  Journal of Business Economics (JBE). Doi:
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  This study is a quasi-replication and extension of Bae et al. (Account Rev 92(2):19– 40, 2017), which examines the relationship between auditors’ characteristics and their audit clients’ investment efficiency. Whereas Bae et al. (Account Rev 92(2):19–40, 2017) use U.S. public firm data, we draw a more general picture by using both public and private firm data from Norway. Overall, the results for ºÚÁÏרÇø public and private firms are in line with those Bae et al. (Account Rev 92(2):19–40, 2017) find for public U.S. firms. That is, audit clients invest more efficiently if their auditors have more knowledge and resources, measured by auditor market shares or whether a Big N audit firm performs the audit. Further, an auditor’s influence on its client’s investment efficiency is more pronounced when clients have a higher demand for information, proxied by client complexity. Finally, exploiting a regulatory change in 2011 that allowed small private ºÚÁÏרÇø firms to opt out of previously mandatory auditing, we extend the study by Bae et al. (Account Rev 92(2):19–40, 2017). We find that audits can increase investment efficiency for small private firms. Specifically, firms that dismiss their auditors tend to overinvest more than similar firms that are not eligible to opt out of auditing. Further, firms that voluntarily keep their auditor have an overall higher investment efficiency than similar firms that are not audited.

• Melaku, Tsegaye; Mekonnen, Zeleke, Tucho, Gudina Terefe, Mecha, Mohammed, Årdal, Christine Oline & Jahre, Marianne (2024)
  Availability of essential, generic medicines before and during COVID-19 at selected public pharmaceutical supply agencies in Ethiopia: a comparative cross-sectional study
  BMJ Open, 14(3). Doi:
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  Objectives Lockdowns and border closures impacted medicine availability during the COVID-19 pandemic. This study aimed to assess the availability of essential, generic medicines for chronic diseases at public pharmaceutical supply agencies in Ethiopia. Design Comparative cross-sectional study. Setting The availability of essential, generic medicines for chronic diseases was assessed at two public pharmaceutical supply agency hubs. Participants The current study included public supply agency hub managers, warehouse managers and forecasting officers at the study setting. Outcomes The assessment encompassed the availability of chronic medicines on the day of data collection, as well as records spanning 8 months before the outbreak and 1 year during the pandemic. A total of 22 medicines were selected based on their inclusion in the national essential drug list for public health facilities, including 17 medicines for cardiovascular disease and 5 for diabetes mellitus. Results The results of the study indicate that the mean availability of the selected basket medicines was 43.3% (95% CI: 37.1 to 49.5) during COVID-19, which was significantly lower than the availability of 67.4% (95% CI: 62.2 to 72.6) before the outbreak (p<0.001). Prior to COVID-19, the overall average line-item fill rate for the selected products was 78%, but it dropped to 49% during the pandemic. Furthermore, the mean number of days out of stock per month was 11.7 (95% CI: 9.9 to 13.5) before the outbreak of COVID-19, which significantly increased to 15.7 (95% CI: 13.2 to 18.2) during the pandemic, indicating a statistically significant difference (p<0.001). Although the prices for some drugs remained relatively stable, there were significant price hikes for some products. For example, the unit price of insulin increased by more than 130%. Conclusion The COVID-19 pandemic worsened the availability of essential chronic medicines, including higher rates of stockouts and unit price hikes for some products in the study setting. The study’s findings imply that the COVID-19 pandemic has aggravated already-existing medicine availability issues. Efforts should be made to develop contingency plans and establish mechanisms to monitor medicine availability and pricing during such crises.

• Steen, Riana & Hansen, Tommy B. (2024)
  Collaborative defense in the Arctic: Strengthening Norway's oil sector resilience through knowledge sharing and vigilance against drone threats
  Risk, Hazards & Crisis in Public Policy (RHCPP). Doi:
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  Norway's oil sector faces significant security challenges due to rapid technological advancements and heightened geopolitical tensions, particularly concerning threats from Russian drones. The sector maintains a vigilant approach, continually monitoring and adapting to evolving threats. This study investigates strategies employed by sector companies to mitigate challenges, emphasizing collaboration, effective network utilization, and learning from past incidents to enhance operational resilience. Our analysis aligns with three thematic areas from the Generic Resilience Management Guidelines developed under the EU-funded H2020 project DARWIN: enhancing coordination in emergency response operations, managing adaptive capacities, and updating procedures and checklists. The study underscores the role of task forces, interdisciplinary teams, and collaborative efforts among industry operators in enhancing adaptability to threats. Findings indicated that although a willingness to draw insights from past incidents exists, a predominant reactive approach to learning prevails. Furthermore, a culture of secrecy prevalent in the sector inhibits knowledge sharing, potentially challenging overall resilience. In this complex context, proactive and transparent security approaches are imperative for Norway's oil sector to enhance resilience. Organizations should adopt a dynamic, technology-integrated risk management approach, involving continuous policy revision and stakeholder engagement, as suggested in contemporary resilience enhancement strategies.

• Hovi, Inger Beate & Bø, Eirill (2024)
  Unlocking the potential: How can parcel lockers drive efficiency and environmental friendliness in E-commerce?
  Sustainable Futures, 7(June 2024), p. 1-11. Doi:
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  This paper analyses the efficiency and carbon footprint of different last-mile delivery solutions, including parcel lockers, pick-up points, and home deliveries. A Decision Support Tool (DST) is developed, utilizing real data on parcel deliveries and time allocation. The DST distinguishes between fixed, variable, and salary costs, revealing that time spent on delivery tasks and associated salary costs are the primary cost drivers. Deliveries to pick-up points are more efficient than deliveries to parcel lockers, but this efficiency depends on the number of parcels delivered. The environmental footprint of the solutions is influenced by how recipients collect their parcels.

• Lyngstadås, Hakim & Berg, Terje (2024)
  The C-Suite of Supplier Collaboration: A Configurational Analysis of the How’s and Why’s.
  International Journal of Logistics Systems and Management, 49(2), p. 188-212. Doi:
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  This study empirically investigates how supplier collaboration (SC) can be configured for developing competitive capability. The configurational solutions are classified according to Lejeune and Yakova's (2005) typology of supply chain management and value creation as explanatory channel mechanism. This makes it possible to explain why competitive capabilities are effective. A survey with 159 respondents from the ºÚÁÏרÇø manufacturing sector is analysed by using a fuzzy set qualitative comparative analysis. The survey was conducted in 2018. Three types in Lejeune and Yakova's (2005) typology are verified through competitive capability based on product quality, while all four types are verified in competitive capability based on low cost. However, there are several equally effective ways of configuring different types to achieve competitive capabilities. The results may be ascribed and theorised according to different value creation channels.

• Kramer, Michael Paul; Viana, Joe, Mueller, Rolf A. E., Hanf, Claus-Henning & Hanf, Jon H (2024)
  Towards a taxonomy of multi-agent simulation models to determine disruptive technology adoption behaviour in the wine industry
  Doi:
• Wang, Yue; Liu, Ming, Viana, Joe & Dube, Nonhlanhla (2024)
  How to improve the quality of emergency supplies? A tripartite evolutionary game model
  Kybernetes. Doi:
• Chen, Zhihong; Hope, Ole-Kristian, Li, Qingyuan & Li, Yongbo (2024)
  Offshore activities and corporate tax avoidance
  Journal of Corporate Finance, 85. Doi:
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  We investigate the relation between tax avoidance and offshore activities using a new text-based measure for offshore activities based on Hoberg and Moon (2017, 2019). Our evidence shows that, although providing cross-border tax-avoidance opportunities, offshore activities reduce the marginal benefits of tax avoidance by introducing incremental foreign-market risk exposure. We find that the intensity of offshore sales of outputs is positively associated with the cash effective tax rate. The effect is stronger when the offshore sales rely on overseas production rather than domestic production, when the offshore sales are located in countries with higher economic uncertainty, when the firm has a lower ability to pass on shocks, and when the firm has less flexibility in adjusting tax strategies.

• Hope, Ole-Kristian; Wang, Cyndia, Wu, Yaqian & Zhang, Min (2024)
  Does Convergence with International Standards on Auditing Improve Audit Quality?
  Accounting Review, 100(2), p. 189-218. Doi:
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  Many countries have converged their domestic auditing standards with International Standards on Auditing (ISA). This study provides global empirical evidence on first-order determinants of audit quality by examining whether and how convergence affects audit quality through utilizing data on 41 jurisdictions and using a staggered difference-in-differences approach. We find that ISA convergence leads to higher audit quality on average. The positive effect is stronger for clients of domestic audit firms, in jurisdictions with stronger enforcement, and when the ISA convergence level is higher. Insights from textual features suggest that changes in principle-orientation, comparability, readability, and size (or length) of auditing standards are positively related to audit quality. Exploratory analyses of textual content using machine learning reveal that the emphases of ISA on going-concern assessment and legal compliance, fraud risk assessment and internal control evaluation, and related-party transactions and su

• Cai, Hong; Hope, Ole-Kristian, Li, Yi, Liu, Qiliang & Wu, Han (2024)
  The (In)Visibility of Undisclosed Political Connections
  Journal of Business Ethics. Doi:
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  Despite a strong investor and social demand for firms to disclose information on political connections, mandatory disclosure requirements face considerable opposition. Given the challenges in enforcing mandatory disclosures, we investigate whether private information acquisition can be a viable alternative to disclosure. Using a setting of corruption investigations, we find that investors, on average, are not aware that the firms they have invested in have connections with the officials under investigation, suggesting a lack of visibility of the connections. However, a small number of institutional investors exploit their private access to information and sell their shares in response to the investigations. We also show that the high costs of information acquisition and a lack of incentives for analysts to disseminate sensitive information they have obtained contribute to this lack of visibility and result in a significant delay in retail investors’ reaction to material information. Our study contributes to the debate on mandating disclosure of political connections by showing that the lack of mandatory disclosure results in an uneven playing field that undermines transparency and fairness.

• Kornberger, Martin; Schott, Clarissa Ruth Marie, Knudsen, Dan-Richard & Andvik, Christian (2024)
  Mapping data-driven management in accounting: the premise and promise of the debate and how to move beyond
  Qualitative Research in Accounting and Management, 22(2), p. 186-198. Doi:
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  This paper aims to point to the shift in the temporal orientation, going from reporting on the past to creating insights about the future, which might be suggestive of perennial managerial attempts to push the boundaries of bounded rationality.

• Orozco, Luciana & Rubio, Silvina (2024)
  Regulatory Capital Management to Exceed Thresholds
  Journal of Money, Credit and Banking. Doi:
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  We investigate whether a carrot approach, which provides benefits for regulatory compliance rather than penalties for noncompliance, incentivizes banks to reach capital levels above the minimum requirements. We document a significant discontinuity at the 10% regulatory capital threshold, where banks receive benefits for exceeding it. Banks exceed it to pay lower deposit insurance fees, access brokered deposits, and expanded financial activities. Banks often rely on equity to reach this threshold while using accounting discretion primarily when facing small capital shortfalls. Our findings suggest the carrot approach can effectively increase banks' capital positions. However, we find that using accounting discretion to exceed the threshold hurts bank stability.

• Penn, Marion & Viana, Joe (2024)
  Infant care transfers: simulating neonatal infant pathways and transfers across a neonatal network
  Journal of the Operational Research Society, 76(9), p. 1731-1748. Doi:
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  Neonatal care for preterm and sick babies is organised into local areas around the United Kingdom, called Operational Delivery Networks. These networks coordinate between providers to ensure babies have the required care, close to home. There are three types of Neonatal Units offering distinct levels of needs-based care. The networks need to ensure that each unit operates at optimal cot levels, and the best quality care is provided. The possible impact of any changes to a network’s configuration on transfers and infant care, must be considered before any changes are implemented. Our simulation model reflects the infant pathways within a network allowing users to evaluate a variety of possible changes within the network. The model builds on previous literature by incorporating the ability to move an existing infant from a unit to release capacity as well as moving new arrivals between units. We also consider the potential environmental impact of the additional travel for parents visiting infants who have been transferred. We demonstrate how the model can be applied with a case network within which approximately 60,000 babies are born annually, a tenth of whom requiring some Neonatal Care. Of these infants, approximately 12% are transferred to another unit.

• Andvik, Elisabeth; Egeland, Therese, Schei, Vidar & Andvik, Christian (2024)
  Escaping the Professional Identity “Straitjacket”: Towards a Model of Identity Plasticity
  Proceedings and Membership Directory - Academy of Management.
• Yang, Wei-Ting; Tamssaouet, Karim & Dauzère-Pérès, Stéphane (2024)
  Bayesian network structure learning using scatter search
  Knowledge-Based Systems, 300, p. 1-14. Doi:
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  Learning the structure of Bayesian networks (BNs) from data is an NP-hard problem as the solution space grows super-exponentially with the number of nodes. Many algorithms have been developed to efficiently find the best structures, with score-based algorithms being those that use heuristics or metaheuristics to explore potential structures in the search space. This paper proposes a new score-based algorithm that relies on a well-known metaheuristic called scatter search, which, to the best of our knowledge, has not been used in learning BN structure. The core of scatter search is to maintain a reference set that stores both high-quality and diverse solutions, thereby continuously tracking and improving the high-quality solutions, while exploring different search directions indicated by the diverse solutions. By incorporating a distance metric in the learning process, the exploration can be more systematic than purely random, as is often the case in most existing algorithms. The effectiveness and efficiency of the proposed algorithm are evaluated through computational experiments. In addition to learning higher-score structures, the results show that scatter search provides a higher degree of robustness compared with benchmark algorithms

• Steen, Riana; Norman, James, Bergström, Johan & Damm, Gitte F. (2024)
  Dark knights: Exploring resilience and hidden workarounds in commercial aviation through mixed methods
  Safety Science, 175. Doi:
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  In this study, the duality of adaptive capacity in aviation safety is examined, where the need for resilience of frontline workers conflicts with the expectations and assumptions of upstream entities, leading to system brittleness. We explore three critical categories: responsibilization, the application of practical wisdom in navigating challenging situations, and the unrecognized sacrifices that accompany adaptation. A qualitative research design is used, using three focus groups consisting of pilots in a European airline, the airline’s safety department, and the respective civil aviation authority. The study's findings reveal i. significant organizational constraint and pressure on pilots, resulting in workarounds, personal playbooks, and exhaustion, ii. a culture of apathy, cynicism, and secrecy, contributing to a disconnect between the idealized and practical aspects of work (work-as-imagined versus work-as-done), iii. an oversimplification of complex issues and attributing problems to individual factors rather than systemic factors, iv. normalizing the risk of saturation by pushing the boundaries of safe performance, and v. the current prescriptive training approach may increase risk by not accounting for adaptations that are necessary in the frontline work environment. Recognizing both the technical and social complexities of aviation, the study calls for a reimagined framework away from a prescriptive training approach, as it may increase risk by not accounting for adaptations that are necessary in the frontline work environment. In summary, the study presents a nuanced view of aviation as a complex system, where the push for adaptivity is challenged by ethical dilemmas and trade-offs. Left unresolved, this conflict may hinder aviation safety.

• Knutsen, Jovana & Arnulf, Jan Ketil (2024)
  Styrer og bærekraft: Norske børsnoterte selskap møter forvetninger med kontroll heller enn strategi
  Magma forskning og viten. Doi:
• Torba, Rahman; Dauzère-Pérès, Stéphane, Yugma, Claude, Gallais, Cédric & Pouzet, Juliette (2024)
  Solving a real-life multi-skill resource-constrained multi-project scheduling problem
  Annals of Operations Research. Doi:
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  This paper addresses a multi-skill resource-constrained multi-project scheduling problem (MSRCMPSP) with different types of resources and complex industrial constraints, which originates from SNCF heavy maintenance factories. Two objective functions, that have been rarely addressed in the literature, are independently considered: (i) Minimization of the sum of the weighted tardiness of the projects and (ii) Minimization of the sum of the weighted duration of the projects. A time-indexed mixed-integer linear programming model is presented with both resource assignment and capacity constraints. To solve large instances with several thousand activities, a new memetic algorithm combining a novel hybrid simulated genetic algorithm with a simulated annealing is implemented. The memetic algorithm is compared with popular solution approaches. Computational experiments conducted on real instances and benchmark instances validate the efficiency of the proposed algorithm.

• Flygansvær, Bente Merete & Dahlstrøm, Robert (2024)
  Enhancing circular supply chains via ecological packaging: An empirical investigation of an extended producer responsibility network
  Journal of Cleaner Production, 468, p. 1-11. Doi:
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  Many industries have established producer responsibility networks, but the affiliated firms are not required to modify their packaging. This research examines conditions that influence the likelihood that firms will develop packaging with an ecological design. This study uses a resource dependency perspective to illustrate how facets of the perceived corporate environment influence packaging decisions. Data collected from 188 firms in a producer responsibility network indicate that financial resources, recycling resources, regulation, internal integration, and customer demand influence the ecological design of plastic packaging. Competitive intensity moderates the effects of customer demand on ecological packaging design. The study concludes by outlining its implications for sustainable packaging practice and research.

• Oorschot, Kim E. van; Johansen, Vilde Aas, Thorup, Nanna Lynes & Aspen, Dina Margrethe (2024)
  Standardization cycles in sustainability reporting within the Global Reporting Initiative
  European Management Journal, 42(4). Doi:
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  To analyze whether Global Reporting Initiative (GRI) standards could reduce transparency in sustainability reporting, we performed a longitudinal content analysis of sustainability reports for 15 large ºÚÁÏרÇø organizations from 2010 to 2020 (inclusive). The content of reports increased by 90%, in contrast to an increase of only 18% in transparency. The content of GRI standards increased by more than 500%. For further examination, we develop a system dynamics model using a multilevel perspective including the standardization organizations, the organizations writing sustainability reports, and their audiences. Our model demonstrates how multilevel interactions may produce unintended results. More standards could impede transparent reporting for organizations, which in turn hinders stakeholders in making fair judgments about the sustainability of organizations. This condition then may trigger a new cycle in which standardization organizations define even more standards. We conclude that for sustainability reporting standards, less is more. Our findings have implications for both researchers and practitioners.

• Zubielqui, Graciela Corral de & Steen, Riana (2024)
  The Impact of Adaptation on Performance Through Business Resilience in Times of Crisis
  Doi:
• Rasmussen, Janicke; Knutsen, Jovana & Arnulf, Jan Ketil (2024)
  Styrer og bærekraft: Norske børsnoterte selskap møter forventninger med kontroll heller enn strategi
  Magma forskning og viten, 27(5), p. 63-72. Doi:
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  Formålet med artikkelen er å identifisere hvordan styrer oppfatter sin rolle for å møte bærekrafts-forventninger. Vi gjennomførte digitale tekstanalyser av ESG-rapporteringen til alle selskap ved Oslo børs som ble ESG-rangert av Refinitiv i perioden 2012–2022. Analysen gir en kvantitativ oversikt over hvordan selskapene har respondert på bærekraftsrelaterte forventninger, og hvordan styrer har organisert arbeidet for å møte forventningene i denne tiårsperioden. Vi finner at styrer i børsnoterte selskap responderer på endring i eksterne bærekrafts-forventninger gjennom økt fokus på kontrollrollen, men bare i liten grad ved å ta strategisk ansvar for utviklingen, som opprinnelig forventet. På bakgrunn av dette mener vi at dagens system for eierstyring og selskapsledelse i Norge (referert til som Corporate Governance-system i denne artikkel) ikke er optimalt for å nå politisk bestemte bærekraftsmål.

• Steen, Riana; Roud, Ensieh, Torp, Trude Mikkelrud & Hansen, Thor-Arild (2024)
  The impact of interorganizational collaboration on the viability of disaster response operations: The Gjerdrum landslide in Norway
  Safety Science, 173. Doi:
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  This study investigates the interorganizational collaboration among agencies that responded to a landslide in Gjerdrum, Norway in 2020. It focuses on the crucial role of communication, coordination, cooperation, and knowledge sharing within organizations, and it examines tensions between centralization and decentralization, professional and administrative leadership, planning and improvisation, and external and internal information sharing. To explore this collaboration, we conducted nine interviews and employed the viable system model (VSM) as a conceptual and methodological framework. Through a systemic diagnosis of the search and rescue (SAR) crisis response system’s viability and by applying the VSM, the structural, communicational, and functional pathologies in interorganizational collaboration were identified. Thus, this diagnostic approach allowed us to determine the pathological features that challenged the SAR system’s effectiveness and viability, including imbalances, inefficiencies in maintaining internal and external interactions, communication breakdowns, and inefficient resource allocation. These insights clarify the structural challenges within the SAR system and underscore the significance of optimizing interconnections, establishing efficient decision-making processes, and improving communication flows to enhance the overall effectiveness of the SAR system.

• Ciconte, William A.; Leiby, Justin & Willekens, Marleen (2024)
  Where Does the Time Go? Auditors’ Commercial Effort, Professional Effort, and Audit Quality
  Journal of Accounting Research, p. 1-63. Doi:
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  Audit theory and regulation assumes that auditors’ commercial motivation threatens audit quality. In this registered report, we use data from two Big Four firms in the Netherlands and provide empirical evidence on the relation between auditors’ commercial motivation and (1) compensation, (2) total audit effort, and (3) audit quality. We proxy commercial motivation as the time that individual auditors report allocating to commercial activities. We hypothesize that auditors’ commercial effort is positively related to compensation and we find mixed support. Next, we hypothesize that auditors’ commercial effort is negatively related to the audit effort but we find no support. Turning to audit quality, we hypothesize a negative direct relation between auditors’ commercial effort and audit quality but we find no support. We also predict a positive indirect relation in which auditors’ commercial effort increases quality control reliance leading to higher audit quality. We find some support for this hypothesis but only when we use technical consultations to proxy for quality control. Auditors with greater commercial effort maintain quality because they rely more on technical consultations. In sum, our study challenges the assumption that auditors’ commercial effort threatens audit quality and questions the need for additional regulation to constrain commercial motivation.

• Ding, Wenhong; Guan, Wei, Ke, Yun, Olsen, Kari Joseph & Shi, Zhenyang (2024)
  Local CEOs and asymmetric cost behaviour
  Accounting and Finance. Doi:
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  We examine the effect of a local CEO (i.e., the CEO's state of origin is the same as his/her firm's headquarter states) on a firm's strategic capacity choices and the resulting cost asymmetry. We find that firms with local CEOs demonstrate greater cost asymmetry. Place attachment, local advantage and agency cost theory could all influence a firm's cost asymmetry. To differentiate between these explanations, we use a consequence test that examines the association between asymmetric costs and future performance. Our results indicate that the greater cost asymmetry in firms with local CEOs is associated with higher future firm value, which suggests that the greater cost asymmetry from local CEOs arises due more to a local advantage. We include several cross-sectional tests to explore when this result is more or less pronounced. Our results suggest that geographically segmented labour markets play an important role in a firm's resource capacity decisions.

• Ruud, Flemming; Schreyer, Marco, Borth, Damian & Vasarhelyia, Miklas (2024)
  A Sum Greater Than Its Parts: Collaborative Artificial Intelligence in Auditing Advancing Audit Models through Federated Learning of Without Sharing Proprietary Data
  Expert Focus, 98(4), p. 180-186.
• Arnulf, Jan Ketil & Knutsen, Jovana (2024)
  Styrer og bærekraft: Norske børsnoterte selskap møter forventninger med kontroll heller enn strategi
  Magma forskning og viten. Doi:
• Dube, Nonhlanhla; Selviaridis, Kostas, Oorschot, Kim E. van & Jahre, Marianne (2024)
  Riding the waves of uncertainty: Towards strategic agility in medicine supply systems
  Journal of Operations Management. Doi:
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  We investigate how organizations embedded in a supply system collectively respond to risks and seize opportunities arising from crisis events under shifting forms of uncertainty. Using the United Kingdom (UK) medicine supply system as the research context, we explore how decision-makers navigated the effects of an event with knowable implications (UK's European Union exit, 2016–2020) followed by an event with unknowable implications (COVID-19 global pandemic, 2020–2021). We adopt a longitudinal case research design that incorporates causal loop diagramming, to understand the system's responses. We find that learning evolves as crisis events unfold, changing from surface (know-what) to deep (know-why and -how) and at the highest level, it is transcendent. Transcendent learning entails understanding system effects into the future (i.e., beyond the past and present) and in relation to other supply systems (i.e., beyond the UK system). Capabilities to absorb, avoid, and accelerate away from shocks are developed sequentially as learning changes. We contribute to prior research by developing a theory of system-level strategic agility and the adaptation processes that underpin it. The latter hinge on dynamic resource (re)allocation and the continuous (re)configuration of processes, protocols, regulations, and structures.

• Cantelmi, Raffaele; Steen, Riana, gravio, Giulio Di & Patriarca, Riccardo (2024)
  An explorative Bayesian analysis of functional dependencies in emergency management systems
  Systems Engineering, p. 1-18. Doi:
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  The study of emergency or crisis management practices acquires strategical relevancefor resilient decision-making under uncertainty. The assessment of system resilience isan asset to identify potential design or operational improvements of a complex socio-technical system, such as an Emergency Management (EM) system. This research aimsat analyzing the functional properties of an EM system recurring to a novel integrationof the Functional Resonance Analysis Method (FRAM) and Bayesian Belief Networks(BBN). The FRAM is used to model and display the actors and the interactions in thesystem, while the BBN, dynamically updated when new data becomes available, sup-ports a complementary quantitative assessment. The methodology is iterated in theanalysis of an EM procedure, issued by a second-line Emergency Response organiza-tion for Oil and Gas (O&G) operators in ºÚÁÏרÇø continental shelf. The results of thestudy show that the proposed stochastic methodology compensates the drawbacks oftraditional FRAM modeling, via the outcomes of BBN quantitative analyses. The find-ings, contextualized in EM, can be transferred to different socio-technical contexts,both military and civil ones

• Shukla, Anurag; Solbakken, Even André & Steen, Riana (2023)
  On the cyber-emergency preparedness in a resilient organization
  Doi:
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  In recent years, the scientific fields of cyber-security and resilience engineering have emerged as new ways to deal with emerging risks in cyber-socio-technical systems. Unlike conventional security management approaches, focusing on historical data to provide an accurate risk picture, resilience engineering aims to enhance an organization's capacity to anticipate, monitor, and adapt to disruptions and surprises. However, with the increasing cyber threats and changes in national and international security policies, there is a pressing need to examine the resilience characteristics of cyber emergency preparedness in both public and private sectors. To address this need, this study adopts a triangulation method, through online survey and interview with two subject matter experts in the cyber-domain and explore factors that might contribute to enhancing cyber emergency preparedness in dealing with potential cyber threats and attacks. Findings suggest that front-line operators have limited information and capacity to process existing data in the domain of cyber security, highlighting a need for enhancing cyber-related knowledge across organizations. Furthermore, 25% of enterprises in the sample update their cybersecurity risk picture only once a year. The lack of more frequent updates downscales the contingency plans' thoroughness and puts companies in a vulnerable situation given the increasing trend of cyber-attacks.

• Mekonnen, Zeleke; Melaku, Tsegaye, Tucho, Gudina Terefe, Mecha, Mohammed, Årdal, Christine & Jahre, Marianne (2023)
  The knock-on effects of COVID-19 pandemic on the supply and availability of generic medicines in Ethiopia: mixed methods study
  BMC Health Services Research, 23(1). Doi:
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  COVID-19 pandemic posed a major impact on the availability and affordability of essential medicines. This study aimed to assess the knock-on effects of the COVID-19 pandemic on the supply availability of non-communicable chronic disease (NCD) medicines and paracetamol products in Ethiopia.

• Tamssaouet, Karim; Engebrethsen, Erna & Dauzère-Pérès, Stéphane (2023)
  Multi-item dynamic lot sizing with multiple transportation modes and item fragmentation
  International Journal of Production Economics, 265, p. 1-15. Doi:
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  This paper addresses a tactical joint inventory and transportation planning problem for multiple items with deterministic and time-varying demand, considering different transportation modes and item fragmentation. The latter corresponds to the splitting of the same item ordered quantity between several trucks or containers. On the one hand, fragmenting the items potentially reduces the number of containers used. On the other hand, loading the item lot fragments on several containers may negatively impact the handling and shipping operations. This new problem is proposed as a way to tackle such conflict. Several Mixed Integer Linear Programming models are proposed for the problem, which rely on two multi-item lot-sizing models with mode selection and two bin-packing models with item fragmentation. A relax-and-fix heuristic is also proposed. Using realistic instances, computational experiments are first conducted to identify the most efficient model in terms of computational time, to study the impact of key parameters on the computational complexity and to analyze the efficiency of the heuristic. Then, managerial insights are derived through additional computational experiments, in particular, to identify contexts requiring joint optimization of lot-sizing and bin-packing decisions, as well as the impact of item fragmentation constraints. Directions for future research are finally proposed.

• Anchev, Stefan & Lapanan, Nicha (2023)
  Investor Base Size and Underreaction-Consistent Stock Return Anomalies
  European Accounting Review. Doi:
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  We find that several well-documented underreaction-consistent stock return anomalies, such as those based on stocks' earnings-to-price ratios, returns on assets and past returns, arise and persist only among stocks with smaller (institutional) investor bases, which are presumably stocks that are neglected by investors. These results are driven by the short side of our long-short trading strategies (i.e., by the seemingly overpriced stocks from the bottom quantiles of the anomaly variables), they appear even after controlling for several stock characteristics (e.g., market capitalization and institutional ownership) and potential risk factors, and they are considerably more pronounced during periods with more information and/or less technology. Overall, these findings suggest that the incomplete dissemination of (negative) information across investors helps in explaining the occurrence and the persistence of the anomalies.

• Kvaal, Erlend; Löw, Edgar, Novotny-Farkas, Zoltán, Panaretou, Argyro, Renders, Annelies & Sampers, Peter (2023)
  Classification and Measurement under IFRS 9: A Commentary and Suggestions for Future Research
  Accounting in Europe. Doi:
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  This paper discusses several issues that were raised by the International Accounting Standards Board (IASB) in their request for information for the post-implementation review (PIR) of the International Financial Reporting Standard (IFRS) 9: Financial instruments – Classification and Measurement. In doing so, we first review the related academic literature and present empirical evidence on the post-adoption impact of IFRS 9. We then discuss conceptual issues associated with the business model and cash flow characteristics assessment in IFRS 9, as well as issues associated with the presentation of fair value changes in other comprehensive income (OCI) and modifications to contractual cash flows. Finally, we identify gaps in the literature and provide suggestions for future research that can help inform accounting standard setters.

• Liu, Junhao; Hope, Ole-Kristian & Hu, Danqi (2023)
  Earnings announcements in China: Overnight-intraday disparity
  Journal of Corporate Finance, 82. Doi:
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  Based on a unique arrangement of trading and disclosure times around earnings announcements in the Chinese stock market, we provide evidence of a striking overnight-intraday disparity in terms of the reaction to earnings news. Specifically, we find that the overnight period exhibits a strong and consistent reaction to earnings announcements, whereas the intraday period trades against both the earnings news and the prior market reaction during the overnight period. In addition, we show that abnormal overnight returns on earnings announcement days exhibit strong predictability for future stock returns, consistent with the overnight returns containing value-relevant signals. In contrast, we observe no return predictability for abnormal intraday returns on earnings announcement days, which as a result, also undermines the return predictability of abnormal daily returns. We propose possible explanations for the overnight-intraday disparity. We conclude that the differences in trading mechanisms between the two periods as well as in investor composition likely drive the phenomenon.

• Hope, Ole-Kristian; Porumb, Vlad-Andrei, Rusanescu, Simona & Vyas, Dushyantkumar (2023)
  Private information and bank-loan pricing: The effectof upcoming corporate spinoffs
  Contemporary Accounting Research, 40(4). Doi:
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  Corporate spinoffs are important events that are accompanied by valuation and credit-risk implications for the parent firm. Among other benefits, spinoffs can improve corporate focus and enhance valuation transparency. In the debt-contracting context, however, spinoffs can also be associated with negative outcomes for the divesting firms. We examine whether banks, due to their timely access to material private information, are able to ascertain the likelihood and the implications of impending spinoffs for the parent firm before a formal public announcement of the spinoff. Our empirical analyses indicate that, in the 365-day pre-spinoff announcement period, banks charge incrementally higher (lower) spreads to borrowers with increased (decreased) post-spinoff riskiness relative to nondivesting firms. This suggests that, while lenders recognize the value- and transparency-enhancing effects of spinoffs, they are also able to foresee potentially negative implications of these divestitures. Cross-sectional analyses indicate that banks charge incrementally lower loan spreads if spinoffs result in high-risk borrowers having either higher reporting quality or lower reporting or operational complexity. These results suggest that the post-spinoff increase in riskiness is compensated by the divestiture benefits typically associated with spinoffs. Similarly, high-risk borrowers incur larger spreads if they do not undergo “focus-increasing” spinoffs. Overall, our findings suggest that banks are able to ex ante determine the implications of important corporate events such as spinoffs.

• Hung, Chung-Yu & Shi, Zhenyang (2023)
  Peer-Specific Knowledge and Peer Group Properties in Relative Performance Evaluation
  Journal of Management Accounting Research, 36(1), p. 173-201. Doi:
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  Although relative performance evaluation (RPE) represents an important compensation practice, selecting a relevant peer firm poses a challenge for compensation committees. We study the implications of a committee’s peer-specific knowledge for the peer group property (i.e., RPE relevance). Committees likely know more about firms within their networks, and such peer-specific knowledge increases with their connections to potential peer firms. Our findings suggest that peer-specific knowledge facilitates not only the inclusion of more relevant peer firms, but also the exclusion of less relevant ones. Moreover, the committees incorporate connected peers’ performance information to a greater extent for risk removal. We address identification challenges by including an intensive set of fixed effects to control for characteristics of the focal and the peer firms and by exploiting exogenous changes to the connections between the committees and the peer firms. Our findings suggest that the compensation committee’s peer-specific knowledge facilitates the RPE practice.

• Zuiderwijk, Dianka; Steen, Riana & Pedro, Ferreira (2023)
  Learning from Operational planning
  International Journal of Business Continuity and Risk Management (IJBCRM), 13(2), p. 165-187. Doi:
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  Institutional and regulatory approaches to planning are still primarily based on linearity and predictability and show a trend towards centralised control and prescriptive planning. A second trend recognises unpredictability in complex operations and focuses on dealing with the changeable nature of work. We refer to this adaptive type of planning as operational planning (OP). In this paper, we argue that a shift towards more control and prescriptive planning can undermine this critical adaptive capability in the completion of complex operations. Triggered by lessons drawn from three different studies, we demonstrate that fostering this adaptive capability in complex operations necessitates a shift in how uncertainty is addressed in institutional and regulatory systems. While exploratory, our findings add to a more complete picture of OP and its relevance to the reliability of complex operations.

• Mustafee, Navonil; Viana, Joe & Harper, Alison (2023)
  Hybrid Models with Real-Time Data in Healthcare: A Focus on Data Synchronization and Experimentation
  Winter simulation conference : proceedings. Doi:
• Steen, Riana; Haakonsen, Geir & Steiro, Trygve Jakobsen (2023)
  Patterns of Learning: A Systemic Analysis of Emergency Response Operations in the North Sea through the Lens of Resilience Engineering
  Infrastructures, 8(2). Doi:
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  Crisis-induced learning (CIL), as a concept, has an ancient history. Although the academic literature offers a range of sophisticated approaches to address CIL, it is still not quite clear how we learn, how we know we have learned, and what challenges and opportunities are involved in the CIL process. To address these questions and navigate ways forward, we need to use a specific real-world subject to capture contextual issues involved in a crisis cycle, which affects the learning process. In this paper, we uncover patterns of learning by exploring contextual issues involved with “actual scenarios” related to three COVID-19 episodes (emergencies) between August and December 2020. To analyze the study’s findings, we use three different themes from the DARWIN Generic Resilience Management Guidelines: (1) supporting the coordination and synchronization of emergency-response operation activities, (2) managing adaptive capacity, and (3) developing and revising procedures and checklists. Looking into these “real scenarios” seems fruitful for understanding patterns of learning, and it results in several learning recommendations. Among others, this study reveals how the uncertainty involved in emergency-response operations creates cognitive demands for emergent problem-solving.

• Mustafee, Navonil; Harper, Alison & Viana, Joe (2023)
  Hybrid Models with Real-time Data: Characterising Real-time Simulation and Digital Twins
  Doi:
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  Real-time Simulation (RtS) and Digital Twins (DT) are terms generally associated with hybrid models that use real-time data to drive computational models. Additionally, in the case of DTs, real-time data is often used to create virtual replicas of the physical system as it progresses through real-time. There is an increasing volume of literature on RtS and DT; however, the field of OR/MS is yet to coalesce on accepted definitions and conceptualisations. This has arguably led to the cascading usage of these terms. The objective of the paper is threefold: (1) distinguish between RtS and DT, (2) present RtS-DT conceptualisation in four dimensions, and (3) present methodological and technical insights on developing RtS with limited data. We argue that the evolution of conventional simulation models to fully-fledged hybrid DTs may necessitate a focus on a transitional stage; namely, RtS models primarily driven using historical distributions with limited real-time data feeds.

• Fiechter, Peter; Landsman, Wayne, Peasnell, Ken & Renders, Annelies (2023)
  Do industry-specific accounting standards matter for capital allocation decisions?
  Journal of Accounting and Economics. Doi:
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  This study examines whether the implementation of industry-specific accounting standards helps capital market participants in making decisions about providing capital to firms. We predict and find an, on average, increase in firms’ capital growth in years following implementation of the relevant industry standard. The increase in capital growth arises primarily from equity issuances and is attributable to the implementation of the standards rather than industry-specific trends or economic shocks. We explore heterogeneity in industry standards and find more pronounced effects for (i) industry standards that reveal new information, provide explicit guidance, or in- crease accounting uniformity, and (ii) small firms, firms with greater information asymmetry, and firms with greater capital constraints before implementation of the standards. We also find evi- dence consistent with two channels explaining the documented increase in capital flows: reduction of information asymmetry and increase in financial statement comparability.

• Flores-Gómez, Mario; Borodin, Valeria & Dauzère-Pérès, Stéphane (2023)
  Maximizing the service level on the makespan in the stochastic flexible job-shop scheduling problem
  Computers & Operations Research, 157. Doi:
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  This paper considers the flexible job-shop scheduling problem with stochastic processing times. To find a sequence insensitive to shop floor disturbances, the available probabilistic information related to the variability of processing times is taken into account by maximizing the makespan service level for a given deadline. This corresponds to the probability of the makespan to be smaller than a given threshold. After showing why this criterion makes sense compared to minimizing the average makespan, a solution approach relying on a tabu search and a Monte Carlo sampling-based approximation is presented. Then, new instances are generated by extending the deterministic benchmark instances. Extensive computational experiments are conducted to evaluate the relevance of the makespan service level and the performance of the proposed solution method. The drawbacks of a number of reference scenarios, including worst-case and best-case scenarios, in addressing effectively the problem under study are presented. A numerical analysis is also performed to compare the scope of the proposed criterion against the minimization of the expected makespan. The accuracy of the proposed solutions induced by the hyper-parameters of the Monte Carlo approximation is explicitly analyzed.

• Wood, David A.; Kulset, Ellen Hiorth Marthinsen, Kuruppu, Gowindage Chamara Jayanath, Lyngstadås, Hakim, Madsen, Dag Øivind, Sundkvist, Charlotte Haugland, Allee, Kristian D., Allen, Abigail M., Almer, Elizabeth D., Ames, Daniel, Arity, Viktor, Achhpilia, Muskan, Barr-Pulliam, Dereck, Basoglu, K. Asli, Belnap, Andrew, Bentley, Jeremiah W., Berglund, Nathan R., Berry, Erica, Bhandari, Avishek, Bhuyan, Md Nazmul Hasan, Black, Paul W., Blondeel, Eva, Adams, Mollie T., Bond, David, Bonrath, Annika, Borthick, A. Faye, Boyle, Erik S., Bradford, Marianne, Brandon, Duane M., Brazel, Joseph F., Brockbank, Bryan G., Burger, Marcus, Byzalov, Dmitri, Aghazadeh, Sanaz, Cannon, James N., Caro, Cecil, Carr, Abraham H., Cathey, Jack, Cating, Ryan, Charron, Kimberly, Chavez, Stacy, Chen, Jason, Chen, Jennifer C., Chen, Jennifer W., Akinyele, Kazeem, Cheng, Christine, Wright, Nicole S., Woolley, Darryl, Wood, Jessica, Wood, Bryan D., Witte, Annie L., Wiseman, Denise, Winrow, Tasia S., Winrow, Timothy, Winrow, Brian, Akpan, Mfon, Berg, Terje, Heinzelmann, Rafael & Johanson, Bjørn Daniel (2023)
  The ChatGPT artificial intelligence chatbot: How well does it answer accounting assessment questions?
  Issues in Accounting Education, 38(4), p. 81-108. Doi:
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  ChatGPT, a language-learning model chatbot, has garnered considerable attention for its ability to respond to users’ questions. Using data from 14 countries and 186 institutions, we compare ChatGPT and student performance for 28,085 questions from accounting assessments and textbook test banks. As of January 2023, ChatGPT provides correct answers for 56.5 percent of questions and partially correct answers for an additional 9.4 percent of questions. When considering point values for questions, students significantly outperform ChatGPT with a 76.7 percent average on assessments compared to 47.5 percent for ChatGPT if no partial credit is awarded and 56.5 percent if partial credit is awarded. Still, ChatGPT performs better than the student average for 15.8 percent of assessments when we include partial credit. We provide evidence of how ChatGPT performs on different question types, accounting topics, class levels, open/closed assessments, and test bank questions. We also discuss implications for accounting education and research.

• Jahre, Marianne; Ditlev-Simonsen, Caroline Dale, Chao, Emmanuel, Czerwinska, Anna C & Mushi, Mary (2023)
  Sustainable New Business Development in the Global South - Supply Chains and Networks
  The international journal of Business and Management in Emerging Markets (IJOBMEM), 2(1).
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  To improve understanding of factors to take into account when developing and implementing new sustainable business opportunities in the Global South. The study uses a phenomenon-based approach. Building on three research streams – sustainable supply chain management (SSCM), the industrial network approach (INA) and sustainable entrepreneurship (SE) – this paper develops a conceptual framework and demonstrates its applicability using a relevant case study: Business Opportunities for the Opuntia cactus (prickly pear) in Tanzania. New business opportunities can be identified from three different perspectives: demand-pull, supply-push, and gaps in supply chains. The proposed framework suggests how to include all three perspectives and what factors to account for in development and implementation.

• Arnulf, Jan Ketil; Rasmussen, Janicke, Hjersing, Sandra & Berner, Thea (2023)
  CEO dismissal as an act of human sacrifice: Metaphor or reality?
  Doi:
• Steen, Riana; Haug, Ole Jacob & Patriarca, Riccardo (2023)
  Business continuity and resilience management: A conceptual framework
  Journal of Contingencies and Crisis Management. Doi:
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  The overall objective of business continuity management (BCM) systems is to provide guidance and analytical subcomponents on how to assess and manage risk and sustain operations when facing a disruptive event. Current BCM practices largely follow a standard structure for formal planning processes and risk-assessment activities. An underlying assumption in standard practices is that systems can be decomposed in subsystems in a meaningful way, as they are tractable and data are available to predict the system's future functionality. However, the reality is much more complex in our volatile world. Standard BCM approaches do not pay adequate attention to the treatment of uncertainties. Thus, they fall short of addressing the complexity of operations involved with emergencies and crisis. Lack of focus on uncertainty hampers the ability of BCM systems to provide sufficient support for decision making in highly uncertain situations. Dealing with such situations necessitates a shift from a defensive risk-management approach, grounded on an illusion of control and accountability, to a proactive stance based on resilience thinking. Responding to this call, we use concepts from the resilience engineering (RE) field and link them to different components of a BCM system. We develop a novel BCM framework and identify a set of resilience influence factors to enhance resilience in BCM systems. We use a case-example, hosted by a leading organization in a second-line emergency response operation in Norway to reflect on the application of a suggested BCM framework.

• Berterottière, Lucas; Dauzère-Pérès, Stéphane & Yugma, Claude (2023)
  Flexible job-shop scheduling with transportation resources
  European Journal of Operational Research, 312(3), p. 890-909. Doi:
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  This paper addresses an extension of the flexible job-shop scheduling problem where transportation resources are explicitly considered when moving jobs from one machine to another. Operations should be assigned to and scheduled on machines and vehicles and the routes of vehicles should be determined. We extend the classical disjunctive graph model to include transportation operations and exploit the graph in an integrated approach to solve the problem. We propose a metaheuristic using a neighborhood function that allows a large set of moves to be explored. As the exact computation of the makespan of every move is time-consuming, we present a move evaluation procedure that runs in constant time (which does not depend on the size of the instance) to choose a promising move in the neighborhood of a solution. This move evaluation procedure is used in a tabu search framework. Computational results show the efficiency of the proposed approach, the quality of the move evaluation procedure and the relevance of explicitly modeling transportation resources. New benchmark instances are also proposed.

• Steen, Riana; Håheim-Saers, Nils & Aukland, Gina (2023)
  Military unmanned aerial vehicle operations through the lens of a high-reliability system: Challenges and opportunities
  Risk, Hazards & Crisis in Public Policy (RHCPP). Doi:
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  This study examines the impact of regulations and standard procedures on safety outcomes in unmanned aerial vehicle (UAV) operations, specifically focussing on ºÚÁÏרÇø military UAV systems, from a high-reliability organization (HRO) perspective. By analyzing data from existing regulations, accident reports, and interviews with military drone pilots using thematic analysis, we identify key recurring themes. Our findings highlight the importance of fatigue and exhaustion due to the absence of regulations on resting time for military drone pilots. This poses substantial risks and increases the likelihood of accidents and incidents in UAV operations. Additionally, we uncover gaps in safety reporting and accountability for military UAV pilots, indicating the need for improved reporting procedures that consider the unique operational elements of UAVs. Effective communication between stakeholders, including drone pilots, ground crew, and air traffic controllers, emerges as a critical factor in maintaining situational awareness. This emphasis on communication is consistent with HRO principles and supports the essential safety tasks of UAV pilots, namely sense-making, decision making, and performance. By uncovering the impact of regulations and operational procedures on safety outcomes and addressing fatigue in UAV operations, this research contributes to enhancing the safety and reliability of ºÚÁÏרÇø military UAV systems.

• Chen, Jeff Zeyun; Elemes, Anastasios, Hope, Ole-Kristian & Yoon, Aaron S. (2023)
  Audit-Firm Profitability: Determinants and Implications for Audit Outcomes
  European Accounting Review. Doi:
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  We use a novel dataset that links audit-firm and client-firm financial statement information from the U.K.’s largest audit firms to examine drivers of audit-firm profitability and its implications for audit outcomes. We first explore the determinants of audit-firm profitability and conclude that Big-4 and non-Big-4 audit firms have fundamentally different profitability structures. Big-4 firms have higher profit margins than non-Big-4 firms. Furthermore, Big-4 profitability increases with client size and complexity, while non-Big-4 profitability is higher for smaller, private-firm clients. Next, we examine the relation between audit-firm profitability and audit outcomes. Using a battery of alternative outcome measures, we find that more profitable audit firms deliver higher audit quality. In supplemental analyses we show that the positive relation between audit-firm profitability and audit outcomes is generally stronger for more influential and illiquid clients (i.e. when auditors are exposed to more litigation risk). Our inferences are robust to several endogeneity controls, such as using an instrumental variables approach, controlling for client-firm and audit-firm fixed effects, employing lead-lag and changes specifications, and assessing bias from correlated omitted variables. Our study contributes to the literature by being the first to provide insights into audit-firm profitability and examine in detail its implications for audit quality.

• Shen, Liji; Dauzère-Pérès, Stéphane & Maecker, Söhnke (2023)
  Energy cost efficient scheduling in flexible job-shop manufacturing systems
  European Journal of Operational Research, 310(3), p. 992-1016. Doi:
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  This paper studies the problem of determining energy efficient schedules in a flexible job shop. The goal is to minimize the total energy cost, given a time-of-use pricing scheme, while ensuring that the schedule does not violate a maximum makespan. The problem is first formalized as a mixed integer program. Because it is already difficult to solve, the simpler problem with a fixed sequence of operations is then extensively studied. Some properties are derived for the specific problem with a fixed sequence. These properties show that the complexity of the problem depends on the structure of the energy pricing scheme. They are also used to propose two heuristic approaches. Relying on these heuristics, we further develop an iterative tabu search for the general problem. Extensive computational experiments are carried out to evaluate the solution methods and the potential gains on the total energy cost, depending on the flexibility associated to the maximum allowed makespan and on the time-of-use structures.

• Kasapidis, Gregory A.; Dauzère-Pérès, Stéphane, Paraskevopoulos, Dimitris C., Repoussis, Panagiotis P. & Tarantilis, Christos D. (2023)
  On the multiresource flexible job-shop scheduling problem with arbitrary precedence graphs
  Production and operations management, 32(7), p. 2322-2330. Doi:
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  This paper aims at linking the work presented in Dauzère-Pérès et al. (1998) and more recently in Kasapidis et al. (2021) on the multiresource flexible job-shop scheduling problem with nonlinear routes or equivalently with arbitrary precedence graphs. In particular, we present a mixed integer linear programming (MIP) model and a constraint programming (CP) model to formulate the problem. We also compare the theorems introduced in Dauzère-Pérès et al. (1998) and Kasapidis et al. (2021) and propose a new theorem extension. Computational experiments were conducted to assess the efficiency and effectiveness of all propositions. Lastly, the proposed MIP and CP models are tested on benchmark problems of the literature and comparisons are made with state-of-the-art algorithms.

• Chen, Lu; Yang, Wenhui, Qiu, Kejun & Dauzère-Pérès, Stéphane (2023)
  A lexicographic optimization approach for a bi-objective parallel-machine scheduling problem minimizing total quality loss and total tardiness
  Computers & Operations Research, 155. Doi:
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  In wafer fabrication, production quality is a key performance index and is subject to machine condition deterioration. This paper studies a parallel-machine scheduling problem that can typically be found in the photolithography process. To solve the problem, a lexicographic optimization approach is proposed where the total quality loss is firstly minimized and the second objective is to minimize total tardiness. An optional maintenance activity is also considered to restore the machine condition to a certain level. Optimality properties are discussed, based on which an exact scheduling algorithm is developed. Experimental analyses derived from real data demonstrate the effectiveness of the proposed algorithm and support some managerial insights.

• Rodoplu, Melek; Dauzère-Pérès, Stéphane & Vialletelle, Philippe (2023)
  Integrated planning of maintenance operations and workload allocation
  International Journal of Production Research, p. 8291-8308. Doi:
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  Motivated by a practical problem, this paper investigates the integrated planning of maintenanceoperations and workload allocation on a set of machines in a workshop. Given quantities of productsto be produced per period on a planning horizon must be processed on unrelated flexible machines.Moreover, each machine has to undergo one or more maintenance operations that must be plannedwithin a given time window and impact products differently. The main goal is to find a feasible planthat satisfies the machine capacity by allocating the production quantities to machines and assign-ing maintenance operations as late as possible in their time windows. Various original mathematicalmodels are presented. In particular, we propose models that allow maintenance operations andsome production quantities to overlap two consecutive periods. Computational experiments basedon industrial data show that allowing this overlapping helps the earliness of maintenance opera-tions to be significantly reduced in the most difficult instances, going for example from a total of 14periods to only 1 period, and by more than 35% on average.

• Hope, Ole-Kristian; Yue, Heng & Zhong, Qinlin (2023)
  Public Communication of Audit Risks and Related-Party Transactions: Evidence from China
  Auditing: A journal of Practice and Theory (AJPT), 42(4), p. 23-44. Doi:
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  This paper examines whether and how firms’ engagement in related-party transactions (RPTs) is shaped by public communication of audit risks as required by the expanded audit report. Using the phased regulatory changes in China and a difference-in-differences design with firm fixed effects and matching, we find that firms significantly reduce their RPTs after the adoption of expanded audit reports (EARs). To investigate potential mechanisms, we find that (1) investor scrutiny increases after the adoption of EARs, (2) the reduction of RPTs is more pronounced when EARs are more likely to attract investor attention, and (3) the reduction of RPTs is weaker when firms are less concerned about investor scrutiny. The results suggest that EARs can attract investor scrutiny and increase the possible penalty associated with self-dealing, thus motivating firms to reduce RPTs.

• Tamssaouet, Karim & Dauzère-Pérès, Stéphane (2023)
  A general efficient neighborhood structure framework for the job-shop and flexible job-shop scheduling problems
  European Journal of Operational Research, 311(2), p. 455-471. Doi:
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  This article introduces a framework that unifies and generalizes well-known literature results related to local search for the job-shop and flexible job-shop scheduling problems. In addition to the choice of the metaheuristic and the neighborhood structure, the success of most of the influential local search approaches relies on the ability to quickly and efficiently rule out infeasible moves and evaluate the quality of the feasible neighbors. Hence, the proposed framework focuses on the feasibility and quality evaluation of a general move when solving the job-shop and flexible job-shop scheduling problems for any regular objective function. The proposed framework is valid for any scheduling problem where the defined neighborhood structure is appropriate, and each solution to the problem can be modeled with a directed acyclic graph with {non-negative weights on nodes and arcs}. The feasibility conditions and quality estimation procedures proposed in the literature rely heavily on information on the existence of a path between two nodes. Thus, based on an original parameterized algorithm that asserts the existence of a path between two nodes, novel generic procedures to evaluate the feasibility of a move and estimate the value of any regular objective function of a neighbor solution are proposed. We show that many well-known literature results are special cases of our results, which can be applied to a wide range of shop scheduling problems.

• Pruijssers, Jorien; Simac, Ines & Willekens, Marleen (2023)
  Strength of Audit Firms’ Human Resource Systems and Client-Level Audit Outcomes: Evidence from a Multiple Source Study
  Accounting Horizons, 38(2), p. 197-224. Doi:
• Hormozi, Mohammad Ali; Dizaji, Hassan Zaki, Bahrami, Hoshang, Sharifyazdi, Mehdi & Monjazi, Nasim (2023)
  Multi-objective optimization of allocating sustainable mechanization for spraying and harvesting systems in paddy fields
  Majallah-i muhandisī-i biyusīstim-i Īrān, 53(4), p. 357-378. Doi:
• Berg, Terje & Lyngstadås, Hakim (2023)
  We’re only in it for the money? Developing sustainable literacy through management accounting curriculum
  Accounting Education. Doi:
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  This article addresses how and why introductory management accounting courses could contribute to sustainable literacy. Drawing on pragmatic constructivism we develop a course design. We base our discussions on teaching experience from two Business Schools. The proposed course design discusses sustainability around five common themes; (i) fundamental concepts, (ii) what are ‘net income’ and ‘value creation’, (iii) product costing and short-term decision-making, (iv) capital budgeting decisions, and (v) performance measurement. We demonstrate that it is possible to introduce sustainability and how it also allows for a better understanding of management accounting as such. Fundamentally, it is illustrated that critical thinking can be integrated at an introductory level in a management accounting course. As such, this study helps develop students’ sustainable literacy. By allowing sustainability to be a natural part of the standard subjects, the article claims that the subject area contributes to the future demands on management accountants as well.

• Hope, Ole-Kristian; Rao, Pingui, Xu, Yanping & Yue, Heng (2022)
  Information sharing between mutual funds and auditors
  Journal of Business Finance & Accounting, 50(1-2). Doi:
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  This paper examines whether there is information sharing between mutual funds and their auditors about the auditors’ other listed firm clients. Using data from the Chinese market, we find that mutual funds earn higher profits from trading in firms that share the same auditors. The effects are more pronounced when firms have a more opaque information environment and when the audit partners for the fund and the partners for the listed firm share school ties. The evidence is consistent with information flowing from auditors to mutual funds, providing mutual funds with an information advantage in firms that share the same auditors. Our findings are robust to the use of audit-firm mergers and acquisitions (M&As) as exogenous shocks and several other robustness checks. We further find that auditors benefit by charging higher audit fees for mutual fund clients and by improving their audit quality for listed firm clients. Our study provides evidence of bi-directional information sharing between two important market intermediaries.

• Penz, Louise; Dauzère-Pérès, Stéphane & Nattaf, Margaux (2022)
  Minimizing the sum of completion times on a single machine with health index and flexible maintenance operations
  Computers & Operations Research, 151. Doi:
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  This paper is motivated by the development of Industry 4.0 and the need to better integrate production and maintenance decisions. Our problem considers a single machine on which jobs of different families are scheduled to minimize the sum of completion times. The machine has a health index which decreases when jobs are processed. To restore the machine health, maintenance operations must be scheduled. Moreover, to be scheduled, each job requires the machine to have a minimum health index which depends on the job family. Two cases are studied: (1) The daily case with a single flexible maintenance operation, and (2) The weekly case with two flexible maintenance operations. The second case is shown to be NP-complete. Two Mixed Integer Linear Programming models are presented for each case. The first model uses ‘‘classical’’ positional variables, while the second model improves the first model by using the notion of master sequence. Different valid inequalities are also proposed. Computational experiments show that the second model is much more efficient than the first model when solved with a standard solver, and the impact of the valid inequalities is discussed.

• Ding, Junwen; Dauzère-Pérès, Stéphane, Shen, Liji & Lü, Zhipeng (2022)
  A Novel Evolutionary Algorithm for Energy-Efficient Scheduling in Flexible Job Shops
  IEEE Transactions on Evolutionary Computation, 27(5), p. 1470-1484. Doi:
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  Improving productivity at the expense of heavy energy consumption is often no longer possible in modern manufacturing industries. Through efficient scheduling technologies, however, we are able to still maintain high productivity while reducing energy costs. This paper addresses a flexible job shop scheduling problem under Time-Of-Use electricity tariffs with the objective of minimizing total energy consumption while considering a predefined makespan constraint. We propose a novel two-individual-based evolutionary (TIE) algorithm, which incorporates several distinguishing features such as a tabu search procedure, a topological order based recombination operator, a new neighborhood structure for this specific problem, and an approximate neighborhood evaluation method. Extensive experiments are conducted on widely used benchmark instances, which show that the proposed TIE outperforms traditional trajectory-based and population-based methods. We also analyze the key features of TIE to identify its critical success factors, and discuss the impact of varying key parameters of the problem to derive practical insights.

• Dube, Nonhlanhla; Li, Qiujun, Selviaridis, Kostas & Jahre, Marianne (2022)
  One crisis, different paths to supply resilience: The case of ventilator procurement for the COVID-19 pandemic
  Journal of Purchasing and Supply Management, 28(5). Doi:
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  This research explores supply resilience through an equifinality lens to establish how buying organizations impacted differently by the same extreme event can strategize and all successfully secure supply. We conduct case study research and use secondary data to investigate how three European governments sourced for ventilators during the first wave of COVID-19. The pandemic had an unprecedented impact on the ventilator market. It disrupted already limited supply and triggered a demand surge. We find multiple paths to supply resilience contingent on redundant capacity and local sourcing options at the pandemic's onset. Low redundancy combined with limited local sourcing options is associated with more diverse strategies and flexibility. The most notable strategy is spurring supplier innovation by fostering collaboration among actors in disparate industries. High redundancy combined with multiple local sourcing options is associated with more focused strategies and agility. One (counter-intuitive) strategy is the rationalization of the supply base.

• Renders, Annelies; Fiechter, Peter & Novotny-Farkas, Zoltán (2022)
  Are Level 3 fair value remeasurements useful? Evidence from FAS 157 rollforward disclosures.
  Accounting Review. Doi:
• Oorschot, Kim E. van; Wassenhove, Luk N. van & Jahre, Marianne (2022)
  Collaboration–competition dilemma in flattening the COVID-19 curve
  Production and operations management. Doi:
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  Testing for COVID-19 is a key intervention that supports tracking and isolation to prevent further infections. However, diagnostic tests are a scarce and finite resource, so abundance in one country can quickly lead to shortages in others, creating a competitive landscape. Countries experience peaks in infections at different times, meaning that the need for diagnostic tests also peaks at different moments. This phase lag implies opportunities for a more collaborative approach, although countries might also worry about the risks of future shortages if they help others by reallocating their excess inventory of diagnostic tests. This article features a simulation model that connects three subsystems: COVID-19 transmission, the diagnostic test supply chain, and public policy interventions aimed at flattening the infection curve. This integrated system approach clarifies that, for public policies, there is a time to be risk-averse and a time for risk-taking, reflecting the different phases of the pandemic (contagion vs. recovery) and the dominant dynamic behavior that occurs in these phases (reinforcing vs. balancing). In the contagion phase, policymakers cannot afford to reject extra diagnostic tests and should take what they can get, in line with a competitive mindset. In the recovery phase, policymakers can afford to give away excess inventory to other countries in need (one-sided collaboration). When a country switches between taking and giving, in a form of two-sided collaboration, it can flatten the curve, not only for itself but also for others.

• Perraudat, Antoine; Dauzère-Pérès, Stéphane & Vialletelle, Philippe (2022)
  Optimizing multiple qualifications of products on non-identical parallel machines
  Computers & Operations Research, 144. Doi:
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  In some manufacturing contexts, such as semiconductor manufacturing, machines must be qualified, or eligible, to process a product, and machines cannot be qualified for all products. This paper investigates the problem of optimizing a given number of new qualifications of products to machines to maximize a flexibility measure that evaluates the balance of the qualification configuration of a work center in terms of utilization rate of machines on a set of non-identical parallel machines. Motivated by empirical observations, new solution approaches, notably inspired by heuristics for discrete location problems and based on the analysis of dual variables, are proposed and compared on industrial data from a semiconductor manufacturing facility and on randomly instances. The use of dual variables leads to heuristics that are effective both in terms of solution quality and computational time. The best proposed approach is currently used in the decision support system of a semiconductor manufacturing facility.

• Oorschot, Kim E. van; Akkermans, Henk A., Wassenhove, Luk N. van & Wang, Yan (2022)
  Organizing for Permanent Beta: Performance Measurement Before versus Performance Monitoring After Release of Digital Services
  International Journal of Operations & Production Management. Doi:
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  Purpose Due to the complexity of digital services, companies are increasingly forced to offer their services “in permanent beta”, requiring continuous fine-tuning and updating. Complexity makes it extremely difficult to predict when and where the next service disruption will occur. The authors examine what this means for performance measurement in digital service supply chains. Design/methodology/approach The authors use a mixed-method research design that combines a longitudinal case study of a European digital TV service provider and a system dynamics simulation analysis of that service provider's digital service supply chain. Findings With increased levels of complexity, traditional performance measurement methods, focused on detection of software bugs before release, become fragile or futile. The authors find that monitoring the performance of the service after release, with fast mitigation when service incidents are discovered, appears to be superior. This involves organizational change when traditional methods, like quality assurance, become less important. Research limitations/implications The performance of digital services needs to be monitored by combining automated data collection about the status of the service with data interpretation using human expertise. Investing in human expertise is equally important as investing in automated processes. Originality/value The authors draw on unique empirical data collected from a digital service provider's struggle with performance measurement of its service over a period of nine years. The authors use simulations to show the impact of complexity on staff allocation.

• Walrave, Bob; Dolmans, Sharon, Oorschot, Kim E. van, Nuijten, Arno L. P., Keil, Mark & Hellemond, Stefan van (2022)
  Dysfunctional Agile-Stage-Gate Hybrid Development: Keeping Up Appearances
  International Journal of Innovation and Technology Management (IJITM), 19(3). Doi:
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  Increasingly, the development of today’s “smart” products requires the integration of both software and hardware in embedded systems. To develop these, hardware firms typically enlist the expertise of software development firms to offer integrated solutions. While hardware firms often work according to a plan-driven approach, software development firms draw on Agile development methods. Interestingly, empirically little is known about the implications and consequences of working according to contrasting development methods in a collaborative project. In response to this research gap, we conducted a process study of a collaborative development project involving a software firm and a hardware firm, within which the two firms worked according to contrasting development methods. We found that the software firm was gradually compelled to forgo its Agile method, creating a role conflict in terms of its way of working. As such, our results contribute to the literature on Agile–Stage-Gate hybrids by demonstrating how, in collaborative embedded systems development, hybridization of development methods may cause projects to fail. Our main practical implication entails the introduction of the “sequential Agile approach.”

• Bø, Eirill & Mjøsund, Christian S. (2022)
  Use of GPS-data to improve transport solutions in a cost and environmental perspective
  Transportation Research Interdisciplinary Perspectives (TRIP), 13(March), p. 1-10. Doi:
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  In this paper we have utilised GPS data as a base to track truck movements and analyse transport activities. Combined with a Decision Support Tool we have investigated how different transport solutions affect the transport cost and CO2 emissions. The information gained from GPS-data helps firms such as a fruit and vegetables wholesaler to gain better insights into their transport solution and operations from a cost and environmental perspective. This also means that the current analysis remains useful for the transporting company in making strategic decisions as to when and where they should engage in other transport assignments to improve the load factors on their trucks. This paper presents that the picture the decision-makers had prior to GPS data being used was different from the real situation, and the insights gained lead to new knowledge and actions. As a result, this would contribute to greener and more cost-efficient solutions.

• Cahan, Steven F.; Che, Limei, Knechel, W. Robert & Svanstrøm, Tobias (2022)
  Do Audit Teams Affect Audit Production and Quality? Evidence from Audit Teams’ Industry Knowledge
  Contemporary Accounting Research, 39(4), p. 2657-2695. Doi:
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  We examine how the extent and distribution of industry knowledge within an audit team affect audit outcomes. While prior research examining the role of auditors' industry knowledge focuses mainly on audit firms, audit offices, and audit partners, audits are conducted by audit teams. Using an audit framework and proprietary data from a Big 4 firm that includes audit hours for each team member, we find that Big 4 audit teams with higher average industry knowledge are associated with more audit effort. In contrast, we find mixed evidence on the relation between the average hourly internal cost rate and team knowledge. Furthermore, we find that balanced teams, which have at least one team member who qualifies as an industry specialist at both the senior rank and junior rank, produce higher-quality audits than teams that have no specialists. In contrast, the audit quality of unbalanced teams, which have a specialist at the senior rank but not the junior rank or vice versa, is not statistically different than teams with no specialists. Overall, our evidence suggests that both the extent and distribution of industry knowledge within a team matter for audit production and that industry knowledge is utilized more effectively when it is spread throughout the team. The findings have useful implications for audit firms and regulators regarding how team composition and industry knowledge affect audit outcomes.

• Akartunali, Kerem & Dauzère-Pérès, Stéphane (2022)
  Dynamic Lot Sizing with Stochastic Demand Timing
  European Journal of Operational Research, 302(1), p. 221-229. Doi:
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  In this paper, a novel way of modeling uncertainty on demand in the single-item dynamic lot sizing problem is proposed and studied. The uncertainty is not related to the demand quantity, but rather to the demand timing, i.e., the demand fully occurs in a single period of a given time interval with a given probability and no partial delivery is allowed. The problem is first motivated and modeled. Our modeling naturally correlates uncertain demands in different periods contrary to most of the literature in lot sizing. Dynamic programs are then proposed for the general case of multiple demands with stochastic demand timing and for several special cases. We also show that the most general case where the backlog cost depends both on the time period and the stochastic demand is NP-hard.

• Bleibtreu, Christopher & Stefani, Ulrike (2022)
  The interdependence between market structure and the quality of audited reports: the case of non-audit services
  Review of accounting studies, 29(2), p. 1524-1574. Doi:
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  This paper addresses the effects of a prohibition of providing non-audit services (NAS) to audit clients. By combining a strategic auditor–client game with a circular market-matching model that has an endogenous number of auditors, we take into account the interdependence between the auditors’ and clients’ incentives, the market structure, and the quality of audited reports. We show that the regulation’s effects depend on the preexisting audit market concentration and the types of blacklisted NAS. In sharp contrast to the effects that regulators desire, a prohibition of providing NAS to audit clients can further increase audit market concentration and decrease the quality of audited reports if the fees that auditors previously earned from providing the blacklisted NAS were relatively high, compared to the reduction in audit costs that result from spillovers. In contrast, a prohibition of the NAS that generate intense spillovers and low NAS fees can have the unexpected—but desired—effect of decreasing market concentration; however, reporting quality also decreases.

• Dauzère-Pérès, Stéphane & Nonås, Sigrid Lise (2022)
  An improved decision support model for scheduling production in an engineer-to-order manufacturer
  4OR. Doi:
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  This paper outlines a mathematical model to solve a scheduling problem for a company engineering and producing propellers to order. Nonås and Olsen (Comput Oper Res 32(9):2351–2382, 2005) have previously introduced a Mixed Integer Programming model for this production setting with the objective of minimizing the total tardiness. The mathematical model could however not be used to solve realistic sized problem instances, because of the very large solution time. We propose a new time indexed formulation that can solve most industrial problem instances in less than 10 min. This work is further extended by taking into account limited storage capacity and by proposing different methods to balance between total tardiness and maximum tardiness. We illustrate how the solution time and the criteria change for different setups of the mathematical model and suggest which setup to use for different scenarios. The paper also discusses how the new model can be extended to include unexpected events such as emergency orders and unavailable production equipment.

• Bø, Eirill; Hovi, Inger Beate & Pinchasik, Daniel Ruben (2022)
  COVID-19 disruptions and ºÚÁÏרÇø food and pharmaceutical supply chains: Insights into supply chain risk management, resilience, and reliability
  Sustainable Futures, 5(December 2023), p. 1-11. Doi:
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  The purpose of this study is to investigate how the COVID-19 crisis affected delivery security and firms’ preparedness and responses in Norway. Investigations focus on supply chains which were critical for maintaining the supply of essential goods when large parts of society closed down. This includes four firms belonging to food and pharmaceutical industries, representing different parts of the respective supply chains, and covering imports, exports, domestic distribution, and home-delivery services. The originality of this article is that we employ theoretical models on supply chain risk management, resilience and reliability in conjunction, where these are usually used separately. Recognizing links, overlaps, and complementarity between the models, and using them step-by-step, we exploit synergies that enable more comprehensive assessments of strengths and weaknesses in firms’ supply chains, covering gaps, prioritizing between improvement areas, and collecting input towards detailed, actionable risk mitigation actions. Investigations build on semi-structured interviews, systematically covering the formative elements for each of the models. Using the models in conjunction, we compare the firms and identify differences, similarities, strengths, and weaknesses in the consequences of pandemic-related disruptions and how firms approached the challenges. The main challenges for the firms were sudden demand changes early in the pandemic. While the firms had minor differences, their pre-pandemic contingency plans were generally not actionable or detailed enough, nor prepared for the pandemic's longevity. Therefore, more detailed and long-term guidelines are desirable, noting the importance and interrelationships of elements of supply chain risk management, resilience, and reliability. A common feature for all firms, and crucial for handling disruptions, is the importance of good and long-term relationships with upstream and downstream supply chain partners and the need for improving contingency plans and future resilience.

• Frennesson, Lina; Kembro, Joakim, Vries, Harwin de, Jahre, Marianne & Wassenhove, Luk Van (2022)
  “International humanitarian organizations’ perspectives on localization efforts”
  International Journal of Disaster Risk Reduction, 83. Doi:
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  The humanitarian sector has formulated a collective strategic intent to localize. This involves delegating responsibilities and transferring capacities and resources to national and local actors. However, progress is slower than expected. Strategy execution is hard, and translating a general strategic intent to the actual way humanitarian organizations operate is not obvious. To suggest remedies for the slow progress, this paper investigates drivers and barriers for international humanitarian organizations (IHOs) to localize their logistics preparedness capacities. It is essential to understand IHOs' perspectives as they are global and powerful actors in the humanitarian sector and by far represent the largest recipients of donor funds. We focus on logistics since it constitutes key activities of strong local contextual character, such as procurement, warehousing, and transport. By interviewing practitioners from a representative set of large IHOs, and connecting the empirical insights with relevant theory, we unravel reasons that hinder localization. These include IHOs' strategic choices due to context-sensitive benefits of localization, mandated expectations on IHOs, the lack of internal drivers for IHOs to localize, and resistance to localize due to IHOs’ desire and motives for continued engagement in humanitarian aid. Based on these insights, actionable propositions are developed to help accelerate progress toward localization.

• Ahlqvist, Victoria; Årdal, Christine Oline, Dube, Nonhlanhla, Jahre, Marianne, Lee, Jin Soo, Melaku, Tsegaye, Moe, Andreas Farstad, Olivier, Max, Selviaridis, Kostas & Viana, Joe (2022)
  Supply chain risk management strategies in normal and abnormal times: policymakers' role in reducing generic medicine shortages
  International Journal of Physical Distribution & Logistics Management. Doi:
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  This paper links supply chain risk management to medicine supply chains to explore the role of policymakers in employing supply chain risk management strategies (SCRMS) to reduce generic medicine shortages. Using secondary data supplemented with primary data, we map and compare seven countries’ SCRMS for handling shortage risks in their paracetamol supply chains before and during the first two waves of the COVID-19 pandemic. Consistent with recent research, the study finds that policymakers had implemented few SCRMS specifically for responding to disruptions caused by COVID-19. However, shortages were largely avoided since multiple strategies for coping with business-as-usual disruptions had been implemented prior to the pandemic. We did find that SCRMS implemented during COVID-19 were not always aligned with those implemented pre-pandemic. We also found that policymakers played both direct and indirect roles. Combining longitudinal secondary data with interviews sheds light on how, regardless of the level of preparedness during normal times, SCRMS can be leveraged to avert shortages in abnormal times. However, the problem is highly complex, which warrants further research Supply chain professionals and policymakers in the healthcare sector can use the findings when developing preparedness and response plans. The insights developed can help policymakers improve the availability of high-volume generic medicines in (ab)normal times. We contribute to prior SCRM research in two ways. First, we operationalize SCRMS in the medicine supply chain context in (ab)normal times, thereby opening avenues for future research on SCRM in this context. Second, we develop insights on the role policymakers play and how they directly implement and indirectly influence the adoption of SCRMS. Based on our findings, we develop a framework that captures the diverse roles of policymakers in SCRM.

• Hope, Ole-Kristian; Li, Congcong, Ma, Mark Shuai & Su, Xijiang (2022)
  Is silence golden sometimes? Management guidance withdrawals during the COVID-19 pandemic
  Review of accounting studies, p. 1-42. Doi:
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  The many management guidance withdrawals during the COVID-19 pandemic have attracted considerable attention from the media, investors, and regulators. This study analyzes the determinants and consequences of these withdrawals. We find that guidance withdrawals are due to economic uncertainty, resulting from firms’ exposure to the COVID-19 pandemic rather than poor financial performance. Also, the effect of COVID-19 exposure on guidance withdrawals is stronger when firms face higher litigation risk. Further, guidance withdrawals result in abnormally large trading volumes and high analyst forecast dispersion but do not harm stock prices or the level of analyst earnings forecasts. Overall we believe the findings have implications for understanding corporate disclosure practices during periods with heightened economic uncertainty.

• Khadri, Ines Julia & Viana, Joe (2022)
  Simulation of IT Data Integration to Optimize an Antibiotics Supply Chain with System Dynamics
  Winter simulation conference : proceedings, p. 1569-1580. Doi:
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  Supply chain (SC) optimization is essential for a firm to cope with everchanging market conditions and disruptions. New technologies have allowed for more advanced supply chain optimization. This paper uses system dynamics (SD) simulation to model the effects of data integration technologies on an antibiotic (AB) SC operation. The study aims to improve the AB SC to benefit all relevant stakeholders including the patient population. We evaluate how IT integration technologies can improve communication across the SC to mitigate or reduce the impact of the of disruptions on AB users. The presented model is under development and is subject to structural and parametric changes as discussions continue with stakeholders about the system structure and what data can be used and disclosed. Despite extensive SC optimization literature there has been a growing call of an evidence base to support decision making relating to national medicine policies.

• Lang, Wei; Lang, Hao, Hui, Eddie C.M., Chen, Tingting, Wu, Jiemin & Jahre, Marianne (2022)
  Measuring urban vibrancy of neighborhood performance using social media data in Oslo, Norway
  Cities: The International Journal of Urban Policy and Planning, 131. Doi:
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  The recent debate on urban vibrancy and its associated spatial characteristics worldwide has increasingly attracted the attention of planners and decision-makers in Norway and the European Union seeking to develop compact cities. This study investigated the spatial pattern of urban vibrancy associated with urban form and the determinants in Oslo, Norway. A total of 552 km2 of the Oslo central metropolitan area was classified into 12 neighborhood groups and a data-driven methodology was applied via SPSS, Python, and ArcGIS to analyze urban vibrancy, where each cell was denoted as a 1 km2 area of 24 variables. As a result of clustering via principal component analysis, six principal components were extracted with 12 critical factors. Results indicated that the location and distribution of commercial buildings, public buildings, residential buildings, and companies and the total population are the most important drivers of neighborhood vibrancy in Oslo. Vibrant neighborhoods usually appear in high-density, central urban areas with a high concentration of commercial and public buildings with various functions along main streets. In contrast, less vibrant neighborhoods have fewer service facilities and are surrounded by single residential areas, large venues, green spaces, vacant land, or land for transportation in the low-density suburban and semi-urbanized areas. This research offers a quantitative basis for a wider range of neighborhood performance assessments, provides a discussion of compact city theory, and draws the attention of decision-makers on planning policy at the neighborhood level, which can also be adapted to other European cities.

• Christ, Quentin; Dauzère-Pérès, Stéphane & Lepelletier, Guillaume (2022)
  A three-step approach for decision support in operational production planning of complex manufacturing systems
  International Journal of Production Research, 61(17). Doi:
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  In this paper, a practical relevant operational production planning problem in complex manufacturing systems is addressed. In this problem, lots are planned individually to provide a more detailed plan than approaches that only consider production quantities. A three-step approach, which is currently fully integrated and used in a Decision Support System, is then introduced. This work follows the one of Mhiri et al. [2018. “Heuristic Algorithm for a WIP Projection Problem at Finite Capacity in Semiconductor Manufacturing.” IEEE Transactions on Semiconductor Manufacturing 31 (1): 62–75] who addressed this problem. We push the approach a step further by introducing new optimisation possibilities through new smoothing rules, whose performance is studied according to different indicators. Furthermore, we present the production planning process in which the decision support tool is embedded and how it bridges the gap between the upper and lower planning levels.

• Che, Limei; Myllymäki, Emma-Riikka & Svanstrøm, Tobias (2022)
  Auditors’ self-assessment of engagement quality and the role of stakeholder priority
  Accounting and Business Research. Doi:
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  This study investigates auditors’ assessment of the quality of their own audit engagements, utilising survey data gathered from a Big Four audit firm in Sweden. We first examine to what extent auditors’ self-reported audit quality threatening behaviours (AQTBs) in the audit process are reflected in their assessment of overall audit quality (OAQ). The results indicate that AQTBs overall and all individual AQTBs are associated with quality assessment, though with variations in their significances. Second, we examine whether AQTBs and OAQ are associated with an auditor’s stakeholder priority, i.e. which stakeholder the auditor considers as her highest priority in the audit work. We find that auditors who consider the employer as the highest priority report more AQTBs. However, priorities are not related to OAQ. Furthermore, auditors prioritising the client or employer tend to assess the overall audit quality as being higher than what the AQTBs would suggest (i.e. they over-assess the quality). Interestingly, the findings regarding priorities are only evident among partners. In sum, the findings of this study provide important insights on how auditors themselves assess their audit quality, and on the role of auditors’ stakeholder priorities.

• Cantelmi, Raffaele; Steen, Riana, Gravio, Giulio Di & Patriarca, Riccardo (2022)
  Resilience in emergency management: Learning from COVID-19 in oil and gas platforms
  International Journal of Disaster Risk Reduction, 76. Doi:
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  Emergency or crisis management, both in civilian or military context, is regarded as a complex socio-technical system, whose dynamic nature and complexity require a holistic approach. Over time, scholars developed diverse strategies and methods to capture such complexity and effectively design emergency plans for more or less severe disasters scenarios. Nonetheless, planning is not always an omni-comprehensive task, pushing organizations to stretch their adaptive capacities in dynamic and challenging settings. This manuscript explores such adaptive capacity as put in place by a leading ºÚÁÏרÇø organization in providing emergency management solutions, facing unexpected challenges (at the time of the event): handling of Covid-19 infection episodes on offshore oil platforms. The study, conducted through the Functional Resonance Analysis Method (FRAM) highlights the relevance of organizational learning which allows to handle emergencies by adapting plans to the specific context and by renewing new emergency management procedures derived from lessons learned. The study focuses on three different Covid-19 infection management cases to understand the nuances of actions and emerging adaptations that led to the development of a revised of an emergency plan, seen again through the lens of FRAM. While the methodological approach refers to Covid-19 infection management, we believe it can be extended into larger crisis management, providing a use case for the applicability of FRAM into emergency management scenarios.