M.A. / As compared with psychoanalytic and other psychotherapies, behaviour therapy appears to have three distinct advantages. First of all, the treatment approach is precise. The target behaviours to be modified are specified, the methods to be used are clearly delineated, and the results can be readily evaluated (Marks, 1982). Second, the use of explicit learning principles is a sound basis for effective interventions as a result of their demonstrated scientific validity (Kazdin & Wilson, 1978). Third, the economy of time and costs is quite good. Not surprisingly, then, the overall outcomes achieved with behaviour therapy compare favourably with those of other approaches (Smith, Glass & Miller, 1980). Behaviour therapy usually achieves results in a short period of time because it is generally directed to specific symptoms, leading to faster relief of an individual's distress and to lower financial costs. In addition, more people can be treated by a given therapist.