“…In ethnomethodology, the unique adequacy requirement of methods refers to the routine recognition and production of local orders of social activities. As Garfinkel and Wieder (1992) , (p. 184, our emphasis) put it, “ethnomethodology is concerned to locate and examine the concerted vulgar uniquely adequate competencies of order* production.” 10 The enactment of methods of order production, or social practices, is uniquely adequate when the courses of action are recognizable for members and can be “taken seriously” by them ( Garfinkel, 2022 , p. 28)—or, as Hofstetter (2022) explains, “unique adequacy means being situated as some plausible local member.” It is a prerequisite for adequate analysis done by analysts both lay and professional ( Garfinkel and Wieder, 1992 , p. 183)—that is, not only by professional researchers (e.g., sociologists, ethnographers, or conversation analysts) but also by practitioners themselves in the studied settings, as they participate in concerted activities. Our earlier excursion into the development of telephony illustrates that as a competence in routine recognition and production of local order, unique adequacy has a historical dimension.…”