“…Research on psychotherapy training, to the extent that it has existed at all, tends to have concentrated on “the teaching and learning of psychotherapeutic skills” (Matarazzo & Patterson, 1986), or on theory‐specific “manuals” (e.g., Beck et al, 1979; Strupp & Binder, 1984), or on particular elements of training, such as supervision (Keum & Wang, 2020; Knox & Hill, 2021; Watkins, 2017), rather than on how psychotherapy training has been systematically organised and conducted as a general enterprise. This part of the larger SPRISTAD collaborative study, focussed on training programmes, aims to be more inclusive by taking an international multisite perspective like that called for by Hill and Knox (2013, p. 803) in their review of training and supervision in psychotherapy: “Multisite longitudinal studies need to be conducted, including careful recording of amounts, types, and quality of training and supervision. … By collecting data at multiple sites, researchers would have large samples, and so would have enough power to investigate the effects of sites, types of training, supervisor characteristics, trainee characteristics, and client characteristics.”…”