In this chapter, we will review studies that have examined many aspects of therapy which, although not strictly relevant to family therapy as such, have made crucial contributions to developing ideas about user-friendliness. It seems to us that the social work tradition has contributed significantly to the development of user-friendly ideas but we will also review studies of marital therapy undertaken in marriage guidance settings. Such studies have also made a similarly important contribution because of the client-centred emphasis of the approach. As a footnote, it is also worth pointing out that client-centred models of family therapy do exist (see, for example Nathaniel Raskin and Ferdinand van der Veen’s (1970) discussion of their Rogerian-inspired approach), but these models seem to have been marginalized by the expert models which became fashionable in the 1970s. Fortunately, Eddy Street has been commissioned to write a book which will help to re-establish this important tradition which has a great deal to contribute to user-friendliness (Street, 1994).