[Evaluative psychotherapy research: clinical relevance of psychotherapy catamnesis].

In this article we will depict the relevance of follow-up studies for evaluative psychotherapy research. Follow-up studies distinguish themselves from pure result studies in that they are clinically more meaningful as they examine the stability of psychotherapy results over a longer period of therapy-free time. The special methodical problems of follow-up studies are discussed and the minimal essentials for the research design of such studies are called for.