The method of Qualitative Comparative Analysis arises both in historical and management research, and in sociological and health research. The aim of QCA is to systematically analyse the possible configurations as a stage of research that follows on from (but also iterates with) a stage of qualitative analysis of cases. In this approach, the 'case' is both the whole set of configurations -- ie the world, really existing as an interlinked whole -- and as a set of comparable 'smaller' objects, e.g. comparing clients, patients, enterprises, or countries. The list exists to promote discussion and debate about QCA and its related variants, such as fuzzy-set social science (Ragin, 2004), realist evaluation (Pawson and Tilley, 1997), and triangulation.