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| Most Similar Systems Design× | Qualitative Comparative Analysis× | |
|---|---|---|
| Fachgebiet | Political Science | Political Science |
| Familie | Process / pipeline | Process / pipeline |
| Entstehungsjahr≠ | 1970 | 1987 |
| Urheber≠ | John Stuart Mill (method of difference); Przeworski & Teune (systems framing) | Charles C. Ragin |
| Typ≠ | Small-N comparative case-selection design | Set-theoretic, configurational comparative method |
| Wegweisende Quelle≠ | Przeworski, A., & Teune, H. (1970). The Logic of Comparative Social Inquiry. New York: Wiley-Interscience. ISBN: 9780471701422 | Ragin, C. C. (1987). The Comparative Method: Moving Beyond Qualitative and Quantitative Strategies. Berkeley: University of California Press. ISBN: 9780520058347 |
| Aliasnamen | MSSD, Most similar cases design, Mill's method of difference, Comparable cases strategy | QCA, csQCA, fsQCA, Configurational comparative method |
| Verwandt | 3 | 3 |
| Zusammenfassung≠ | The most similar systems design (MSSD) is a small-N comparative strategy that selects cases as alike as possible on many background characteristics but differing on the outcome of interest. By matching cases so that most potential confounders are held roughly constant, the design isolates the few factors that vary alongside the outcome as the candidate causes. Rooted in John Stuart Mill's method of difference and named by Przeworski and Teune, it is a cornerstone of comparative politics for drawing causal inferences from a handful of countries or cases. | Qualitative Comparative Analysis (QCA) is a set-theoretic, configurational method that identifies which combinations of conditions are necessary or sufficient for an outcome across a set of cases. Developed by Charles Ragin, it treats each case as a configuration of set memberships, builds a truth table of all logically possible combinations, and uses Boolean algebra to minimize them into the simplest expressions that account for the outcome. It bridges qualitative case knowledge and cross-case generalization, embracing causal complexity through conjunctural causation, equifinality, and asymmetry. |
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