This article presents an outline of historical and situational arguments which suggest a focus on deconversion, an outline of conversion research and its consequences for deconversion, and a discussion of extant empirical research on deconversion. The discussion then focuses on the conceptualization of deconversion and compiles the features from which a comprehensive concept of deconversion may emerge. The core features of the deconversion concept which is suggested in this article are complemented by dimensions of diversity which also include a developmental perspective (from the religious styles perspective). This has implications for future research.