“…The theoretical background (Caplan, 1964(Caplan, , 1974Polak, 1967Polak, , 1970 and practical procedures (Fish, 1971;Polak, 1971aPolak, , 1972 brought together here were first explored and established 30 and more years ago. One of the earliest mobile psychiatric emergency services was set up in Amsterdam 70 years ago, with the aim of preventing hospitalisation (Querido, 1968).…”