Is psychotherapy dependent upon diagnosis?

Abstract

At first glance, such a question as that posed in the title of this paper may seem absurd. The tendency would be to answer immediately: Yes, of course, and to refer to the field of medicine, where it is quite apparent that therapeutic measures are determined by differential diagnosis. Thorne writes in this connection: It seems elemental that rational treatment cannot be planned and executed until an accurate diagnosis has been made (9, p. 319).