• 9th International QCA Expert Workshop at ETH Zurich

    On December 13-15, I took part virtually in the 9th International QCA Expert Workshop and 5th International QCA Paper Development Workshop at ETH Zurich (organized by Manuel Fischer, Julia Leib, Johannes Meuer, Sofia Pagliarin, Ryan Rumble, and Christian Rupietta). The main workshop brought together a group of about 30 QCA experts from around the globe, most of whom participated online to discuss methodological innovations, the diffusion of QCA, and new measures of validity and robustness. The preceding paper development workshop included more than a dozen roundtables with about 50 applied QCA papers that were presented and discussed. I co-chaired roundtables with Sofia Pagliarin (Erasmus University Rotterdam) and Nena Oana (European University Institute), presented my recent QCA textbook Qualitative Comparative Analysis: An Introduction to Research Design and Application (Georgetown University Press), and took part in the jury for the QCA Best Paper Award (together with Yunzhou Du, Peer Fiss, Benoît Rihoux, Carsten Schneider, and Eva Thomann).


  • QCA Book Published with Georgetown University Press

    Georgetown University Press has just published my QCA textbook Qualitative Comparative Analysis: An Introduction to Research Design and Application. Following an ideal-typical research cycle, the book’s ten chapters cover the methodological basis and analytical routine of QCA, as well as matters of research design, causation and causal complexity, and QCA variants. A comprehensive glossary helps to clarify frequently used terms. The book is complemented by an accessible online R manual to help new users practice QCA’s analytical steps on sample data and then implement those steps with their own findings. The book further contains boxes by other authors from across the social sciences, who are reflecting on their own QCA applications and their use of specific variants of the method. For more information, reviews, and online material, please click the button below.


  • QCA-Workshop, Universität Jena

    Am 30. September und 1. Oktober 2021 habe ich am Fachbereich Interkulturelle Wirtschaftskommunikation (IWK) der Friedrich-Schiller-Universität Jena einen virtuellen Workshop zu Qualitative Comparative Analysis (QCA) gehalten. Der Workshop diente der allgemeinen Einführung in die QCA-Methodik sowie der konkreten Anwendung von QCA im Rahmen laufender Forschungsprojekte des IWK.

    Herzlichen Dank an das ganze IWK-Team für den konstruktiven Workshop und den anregenden Austausch zu sozialwissenschaftlichen Methoden!


  • Foreign Policy Change in Europe

    Palgrave just published the edited volume Foreign Policy Change in Europe Since 1991, co-edited by Jeroen Joly (Saint-Louis University Brussels) and Tim Haesebrouck (Ghent University). The book analyzes foreign policy change and continuity across 11 European countries throughout the past three decades. I contributed a chapter on German Foreign Policy to the volume.

    Many thanks to the editors for inviting me to contribute to this project!

  • 25th Swiss Summer School in Social Science Methods, Lugano 2021

    From August 23-27, 2021 I taught at the 25th Summer School in Social Science Methods, organized by the Swiss Foundation for Social Science (FORS) and the Università della Svizzera Italiana (USI). The summer school is hosted at USI in beautiful Lugano, Switzerland. This was the third time that I offered a one-week intensive course on Qualitative Comparative Analysis (QCA) at the Swiss Summer School in Lugano (after 2016 and 2019, respectively). The course was offered in hybrid format, with in-presence and online participants attending the course. The course was based on my QCA textbook Qualitative Comparative Analysis: An Introduction to Research Design and Application, published with Georgetown University Press (2021, Publisher’s Website). Many thanks to all course participants for an intensive and fun week with QCA! And thanks to School Coordinator Janice Casarella and the School Directors Eugène Horber, Patrick Gagliardini, and Benedetto Lepori for the excellent and smooth organization!

  • Researching Non-State Actors in International Security – Now Open Access

    The Routledge volume Researching Non-State Actors in International Security: Theory and Practice, edited by Andreas Kruck and Andrea Schneiker, has now been turned into a fully open access book. The book contains chapters on “interpreting texts” (Part I), “establishing causal claims” (Part II), and “doing fieldwork” (Part III). I contributed a chapter on “Qualitative Comparative Analysis and the Study of Non-State Actors” to Part II of the volume. The book’s substantive chapters are complemented by “discussion chapters” where commentators draw together and reflect upon the respective areas of research. Many thanks to the editors and other contributors for their efforts turning this into an open access book! I am grateful for the open access funding approved by the University of Erfurt to contribute to this aim.

  • QCA-Workshop, Universität Halle

    Am 21. und 22. Juli 2021 habe ich an der Medizinischen Fakultät der Martin-Luther-Universität Halle-Wittenberg einen Workshop zu Qualitative Comparative Analysis (QCA) gehalten. Der Workshop richtete sich gezielt auf die Anwendung von QCA im Rahmen eines laufenden Forschungsprojekts am Institut für Gesundheits- und Pflegewissenschaft der Uni Halle. Herzlichen Dank an das ganze Forschungsteam für die Einladung nach Halle und für den konstruktiven und anregenden Präsenz-Workshop!

  • Gastvortrag, EIPCC Nachwuchskolleg

    Am 14. Juli 2021 habe ich am Nachwuchskolleg „Effective and Innovative Policymaking in Contested Contexts“ (EIPCC) der Universität Erfurt einen virtuellen Gastvortrag zum Thema “Research Design and Methods” gehalten. Der Vortrag für Doktorandinnen und Doktoranden des EIPCC erläuterte grundlegende Fragen zu Forschungsdesign, Kausalität, sowie qualitativen und quantitativen Methoden der Sozialwissenschaften. Das EIPCC-Nachwuchskolleg der Universität Erfurt wurde Anfang 2021 von der Willy Brandt School of Public Policy, der Staatswissen-schaftlichen Fakultät und dem Max-Weber-Kolleg gegründet. Herzlichen Dank an die beiden Sprecherinnen der EIPCC-Kollegiat*innen, Stephanie Gast Zepeda und Almut Mohr, für die Einladung und an alle Teilnehmenden für die angeregte Diskussion im Anschluß an den Vortrag!

  • Gastvortrag, Universität Bamberg

    Am 24. Juni 2021 habe ich an der Bamberg Graduate School of Social Sciences der Universität Bamberg einen virtuellen Gastvortrag zum Thema “The Unintended Consequences of UN Sanctions” gehalten. Der Vortrag basierte auf einem gemeinsamen Paper mit Dr. Katharina Meissner (Universität Wien) zu nichtintendierten negativen Auswirkungen von Sanktionsregimen auf Basis von Daten des Targeted Sanctions Consortium (TSC). Vielen Dank an Dr. Sofia Pagliarin und das BAGSS-Team für die Einladung und an alle Teilnehmenden für die sehr engagierte und konstruktive Diskussion im Anschluß an den Vortrag!

  • QCA Faculty Workshop, University of Pennsylvania

    Qualitative Comparative Analysis: Research Design and Application

    On April 29-30, I taught a virtual workshop for 13 faculty members of the Perelman School of Medicine at the University of Pennsylvania, who are working on health-related applications of Qualitative Comparative Analysis. The intensive course followed the structure of my QCA textbook, which will be published with Georgetown University Press later this year (information about the book can be found here). Dating its foundation to 1740 with Benjamin Franklin as its first president, the University of Pennsylvania is a private Ivy League research university in Philadelphia, Pennsylvania. The Perelman School of Medicine is frequently ranked among the leading medical schools in the world. Thanks to everyone involved for turning this into a highly constructive two-day workshop experience!

  • Gastvortrag, Zeppelin Universität

    Am 22. April 2021 habe ich an der Zeppelin Universität am Lehrstuhl für Global Governance von Prof. Andrea Schneiker einen virtuellen Gastvortrag zum Thema “Democracy and War Involvement” gehalten. Nach einem Überblick zu Kriegsbeteiligungen westlicher Demokratien in den vergangenen Jahrzehnten lag der Schwerpunkt auf meiner vergleichenden Studie zum Abzug aus dem Irakkrieg, welche Bedingungen für den Abzug bzw. Verbleib westlicher Regierungen im Irak identifiziert (51 Regierungen aus 29 Demokratien im Zeitverlauf, 2003–2008). Herzlichen Dank an Prof. Andrea Schneiker und das Lehrstuhlteam für die Einladung und an die teilnehmenden Studierenden für die sehr engagierte Diskussion! Der Artikel im European Journal of International Security ist 2020 erschienen und frei verfügbar (open access). Eine Zusammenfassung findet sich im EJIS-Blog.

  • ISA Annual Convention 2021

    62nd Annual Convention of the International Studies Association, April 6-9, 2021

    At this year’s Annual Convention of the International Studies Association (ISA), I had four program appearances. The conference had initially been scheduled to take place in Las Vegas, but the COVID-19 pandemic made a shift to a virtual format necessary.

    Together with Eugénia da Conceição-Heldt, Omar Serrano Oswald, and Anna Novoselova, we presented a paper on “Survival and Resilience of the UN Joint Inspection Unit“, based on our DFG research project, in a panel on the “Persistence and Resilience of International Organizations”, chaired and discussed by Orfeo Fioretos. I further contributed to the “Foreign Policy Analysis Methods Café“, chaired by Falk Ostermann, and I took part in the roundtable “Qualitative Comparative Analysis in International Relations“, chaired by Tobias Ide. Finally, I also served as chair and discussant in the panel “Statecraft in the 21st Century” (for details on the panels and roundtables, see below).

    Besides these contributions, I also took part in the Business Meeting of ISA’s Foreign Policy Analysis Section and the Editorial Board Meeting of the section’s journal Foreign Policy Analysis (Oxford University Press).

    Overall, the virtual platform worked seamlessly and many of the panels were incredibly well-attended, with about 45 participants in the Methods Café and 30 participants in the panel on International Organizations. Nonetheless, the in-person interaction is surely missing, so let’s hope that next year’s ISA can take place as planned, in Nashville, Tennessee, March 2022!

  • QCA Workshop, University of Lausanne

    Qualitative Comparative Analysis (QCA)

    On January 14-15, I jointly co-taught a workshop on Qualitative Comparative Analysis (QCA) at the University of Lausanne, together with Benoît Rihoux of UC Louvain. Course participants were PhD students of the CUSO network of Western Switzerland (Universities of Lausanne, Fribourg, Genève, and Neuchâtel). Many thanks to the people at CUSO for the invitation and organization of the event and to the participants for a constructive workshop!

  • Summer School in Social Science Methods, Lugano 2021

    Qualitative Comparative Analysis at the 25th Summer School in Social Science Methods, 2021

    The workshop program was announced for the 25th Summer School in Social Science Methods, organized by the Swiss Foundation for Social Science Research (FORS) and the Università della Svizzera Italiana (USI). The school is hosted at USI in beautiful Lugano, Switzerland. For the third time, I am offering a one-week intensive course on Qualitative Comparative Analysis (QCA) at the Swiss Summer School. The course runs from August 23-27, 2021. The course is based on my QCA textbook Qualitative Comparative Analysis: An Introduction to Research Design and Application (Georgetown University Press). Course registration will open at the end of January/early February 2021. The opening will be announced through the summer school’s newsletter (sign-up on the registration page).

    Workshop contents

    This workshop gives a thorough introduction to the method of Qualitative Comparative Analysis (QCA), with an emphasis on research design and practical application. Since its inception (Ragin 1987), QCA has gained recognition among social scientists as a case-based research method that is ideally suited to capture causal complexity. This essentially describes a situation where an outcome results from multiple pathways and different combinations of conditions. Moreover, QCA entails a rigorous and systematic comparison of selected cases and their configurations through Boolean logic and a software-based analytical protocol.

    Throughout this workshop, participants will be introduced to the building blocks of QCA, while the course structure follows an ideal-typical research process. The introduction opens with empirical illustrations to show how and for what purposes QCA is being used, before summarizing the method’s key characteristics. This is followed by sessions on causation, causal complexity, and research design, to provide a foundation for thinking about empirical applications. The ensuing sessions engage with the use of QCA as an analytical approach, starting with set theory and concepts like necessary and sufficient conditions, Boolean algebra, truth tables, and fuzzy sets. In calibrating sets, we look into approaches to transform empirical raw data into crisp and fuzzy sets. Next, the course examines various measures of fit that help in evaluating QCA results. The session on set-theoretic analysis puts all of the elements together and shows how empirical data is analyzed and interpreted with QCA. Finally, the workshop closes with sessions on advanced topics, which can be tailored based on participants’ background and research interests. Potential topics include multi-method research design, QCA variants, addressing critiques, and recent developments. The workshop sessions are complemented by illustrations and exercises, using the R Software environment and relevant R Packages.

  • BJPIR Most Cited Article

    The British Journal of Politics and International Relations (BJPIR) highlights our article “Parliaments in Security Policy: Involvement, Politicisation, and Influence” (with Dirk Peters, Peace Research Institute Frankfurt) as the most cited article in this journal in the last 3 years (as of January 7, 2021). Notably, 5 of the 10 most cited articles stem from our special issue on parliaments and security policy. Thanks to all our contributors for turning this collective project into such a success!



    Abstract: While parliaments have long been neglected actors in the analysis of security policy, a research literature on the subject is growing. Current research is focused primarily on how parliaments, relying on formal legal competences, can constrain governmental policies. However, this research needs expansion in three areas. First, informal sources of parliamentary influence on security policy deserve more systematic attention as the significance of parliaments often hinges on contextual factors and individual decision-makers. Second, we still lack a systematic understanding of the effects of parliamentary involvement on security policy. Finally, the role of parliaments for the politics of security is almost completely uncharted territory. When parliaments become involved in security policy, does it foster transparency and contribute to the politicisation of security policy so that security policy becomes a ‘normal’ political issue? The article reviews current research, derives findings from the contributions to this Special Issue, and spells out their wider implications.

    Introduction to the special issue:

    Mello, Patrick A., and Dirk Peters (2018) ‘Parliaments in Security Policy: Involvement, Politicisation, and Influence’, British Journal of Politics and International Relations https://doi.org/10.1177/1369148117745684.

    Contributing articles:

    Strong, James (2018) ‘The War Powers of the British Parliament: What Has Been Established and What Remains Unclear?’, British Journal of Politics and International Relations https://doi.org/10.1177/1369148117745767.

    Kaarbo, Juliet (2018) ‘Prime Minister Leadership Style and the Role of Parliament in Security Policy’, British Journal of Politics and International Relations https://doi.org/10.1177/1369148117745679.

    Kriner, Douglas L. (2018) ‘Congress, Public Opinion, and an Informal Constraint on the Commander-in-Chief’, British Journal of Politics and International Relations https://doi.org/10.1177/1369148117745860.

    Rosén, Guri, and Kolja Raube (2018) ‘Influence Beyond Formal Powers: The Parliamentarisation of European Union Security Policy’, British Journal of Politics and International Relations https://doi.org/10.1177/1369148117747105.

    Schade, Daniel (2018) ‘Limiting or Liberating? The Influence of Parliaments on Military Deployments in Multinational Settings’, British Journal of Politics and International Relations https://doi.org/10.1177/1369148117746918.

    Oktay, Sibel (2018) ‘Chamber of Opportunities: Legislative Politics and Coalition Security Policy’, British Journal of Politics and International Relations https://doi.org/10.1177/1369148117745680.

    Wagner, Wolfgang (2018) ‘Is There a Parliamentary Peace? Parliamentary Veto Power and Military Interventions from Kosovo to Daesh’, British Journal of Politics and International Relations https://doi.org/10.1177/1369148117745859.

    Lagassé, Philippe, and Patrick A. Mello (2018) ‘The Unintended Consequences of Parliamentary Involvement: Elite Collusion and Afghanistan Deployments in Canada and Germany’, British Journal of Politics and International Relations https://doi.org/10.1177/1369148117745681.

    Raunio, Tapio (2018) ‘Parliament as an Arena for Politicization: The Finnish Eduskunta and Crisis Management Operations’, British Journal of Politics and International Relations https://doi.org/10.1177/1369148117745682.

    Hegemann, Hendrik (2018) ‘Towards ‘Normal’ Politics? Security, Parliaments and the Politicisation of Intelligence Oversight in the German Bundestag’, British Journal of Politics and International Relations https://doi.org/10.1177/1369148117745683.

  • Open Access FPA Article

    Our recent Foreign Policy Analysis article “Patterns of Political Ideology and Security Policy” (with Tim Haesebrouck, Ghent University) has been turned into Gold Open Access by Oxford University Press. The PDF can now be freely accessed. We thank the University of Erfurt for approving our funding application.

    Abstract: Recent studies on political ideology suggest the existence of partisan divides on matters of foreign and security policy – challenging the notion that “politics stops at the water’s edge”. However, when taken as a whole, extant work provides decidedly mixed evidence of party-political differences outside domestic politics. This article first conducts a systematic empirical analysis of the relationship between parties’ left-right positions and their general attitude towards peace and security missions, which suggests that right-leaning parties tend to be more supportive of military operations. Yet, the results also show that the empirical pattern is curvilinear: centrist and center-right parties witness the highest level of support for military missions, while parties on both ends of the political spectrum show substantially less support. The second part of our analysis examines whether the stronger support of rightist parties for peace and security missions translates into a greater inclination of right-wing governments to actually deploy forces to military operations. Strikingly, our results suggest that leftist governments were actually more inclined to participate in operations than their right-leaning counterparts. The greater willingness of left-wing executives to deploy military forces is the result of their greater inclination to participate in operations with inclusive goals.