Qualitative Comparative Analysis / QCA
Updated 2026-08-13
INTRODUCTION
English translation pending.
CORE DEFINITION
Introduced by Charles Ragin, qualitative comparative analysis encodes cases as membership in sets and uses Boolean minimisation to identify the combinations of conditions that produce an outcome, distinguishing necessary conditions from sufficient configurations. It handles causal complexity such as conjunctural causation, equifinality, and asymmetry without requiring large samples. The qualification is that results depend heavily on calibration thresholds and on case selection, so the analysis is only as credible as those judgements.
SCAFFOLDING EFFECT
Reduce cognitive load
- Use Configuration Thinking: ask which combination of conditions is jointly sufficient rather than which single factor matters. - Use Equifinality Check: look for several distinct paths that each lead to the same outcome.
Anchor fast decisions
Regression estimates the average effect of one variable while holding others fixed, which assumes causes act independently and symmetrically. Boolean minimisation instead compares the condition sets of cases with and without the outcome, so it can represent situations where a factor works only in combination and where the absence of the outcome has different causes.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Qualitative_comparative_analysisverified
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