A widely accepted orthodoxy is that it is impossible to do replication studies within qualitative research paradigms. Ontologically and epistemologically speaking, such a view is largely correct. However, in this paper, I propose that what I call comparative re-production research--that is, the empirical study of qualitative phenomena that occur in one context, which are then shown also to obtain in another--is a well-attested practice in ethnomethodological conversation analysis (CA). By extension, I further argue that researchers who do research on second and foreign language (L2) classrooms inspired by the conversation analysis-for-second-language acquisition movement should engage in comparative re-production research in order to make broad statements about the generality or prototypicality of the qualitative organization of particular practices across languages, cultures and institutional contexts.