“…Although the absence of a therapist rules out therapist effects, once he is present, he may well affect (for either good or ill) even a process which could have been set up to run without him. Similarly, the absence of sex-pairing effects in desensitization (Nawas & Pucel, 1971) is poor evidence against the sort of relationship factors implied by the Vitalo and the Mickelson & Stevic studies. Indeed, Morris & Suckerman (1974a, b) have demonstrated the effect of therapist warmth on the effectiveness of systematic desensitization, whether this is carried out 'live' (Morris & Suckerman, 1974u), or by an automated procedure with a pre-recorded therapist (Moms & Suckerman, 1974b).…”