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PurposeLiterature review articles have become a frequently applied research approach in operations and supply chain management (SCM). The purpose of this paper aims to elaborate on four approaches for developing or employing theory in systematic literature reviews (SLRs).Design/methodology/approachThe paper uses conceptual arguments and illustrates them by pointing to recent examples. In SLRs, the material collection is usually based on keywords and searching databases, which is comparatively well documented. Data analysis, however, often falls short in documentation and, consequently, is neither well explained nor replicable. Therefore, the focus of this paper is the elaboration of the data analysis and sense-making stage in the research process of SLRs.FindingsThe paper presents four different approaches, which are characterized as theory (1) building, (2) modification, (3) refinement and (4) extension, based on whether new concepts are formed or extant concepts within SCM or other fields of management theory are adopted.Research limitations/implicationsThe limitation of this research is that literature reviews could be conducted and presented in many ways. Since the focus of this research is on systematic literature reviews, only a limited number of approaches can be discussed and presented here.Originality/valueThe paper contributes to explaining the process and expected outcomes of a literature review and, therefore, aids in further developing the related methodological approaches. This is relevant as literature review publications now often replace conceptual or theoretical pieces but still have to deliver concerning demands of theory building.

PurposeThe COVID-19 pandemic has challenged supply chains (SCs) around the globe unprecedentedly. This study aims to gain insights on the impacts of the pandemic on SCs and their management under consideration of different regional contexts on a global scale.Design/methodology/approachA Delphi study collects the expertise of global SC academics on the SC vulnerabilities and the measures for responding to disruptions, improving resilience, and restoring operations. Data from three polls are systematically analyzed by content, frequency, and cluster analysis.FindingsThe study identifies and ranks ten major issues related to SC vulnerabilities and management strategies for specific SC processes and geographical regions. Detected differences among the considered geographical regions point towards particular challenges and call for specific measures to integrate regional contingencies into SC management. In a regional comparison, China and Iran as well as Africa clearly stand out, but also Europe/North America, India/Pakistan, and Brazil show geographical particularities.Research limitations/implicationsThe responses are collected against the COVID-19 pandemic, while the findings show differences among the regions thereby arguing for taking regional contingencies into account in managing SCs.Practical implicationsSC resilience is a core aim, which was emphasized by the COVID-19 pandemic. The findings provide insights and challenges that managers would have to meet in the different regions covered.Originality/valueThis paper contributes to existing knowledge on SC risks and SC resilience in context to extreme situations. Given that events, such as the COVID-19 pandemic, will become more frequent in the future due to climate change and geopolitical tensions, insights into how to manage SCs under extreme conditions and into regional differences are crucial.