Qualitative Comparative Analysis (QCA) has become an established component of political science methods. This chapter presents QCA as a case study of the (successful) introduction of a new procedure to the methods canon. It first briefly reviews its development and the various junctures which had to be overcome in order to establish the method. It then points to some extensions and variants of the original proposal which underwent different destinies. The chapter furthermore acknowledges the existence of numerous debates around QCA, some questioning the method as a whole and others—mainly originating from within the QCA community—criticizing and often also improving selected aspects of the analytical protocol and its application. This results in a critical assessment of three recent trends of QCA development, namely quantification, automatization, and standardization. It is held that, while being welcome in principle, these trends have also led to negative side effects often overlooked in the QCA community. It is argued that professionalization and wide diffusion of a method often also bear the risk that the original intention and roots get lost, which sometimes might even worsen the quality of a method and its application.