Subject of this volume is the summing up of the 1st European Conference On Psychotherapy Research, which was organized by the SPR in Trier (FRG) in September 1981. The first volume is dedicated to methodology in psychotherapy research. The chapters are: Selected papers on methodological problems in psychotherapy research - Computer aided analysis of psychotherapeutic discourse - Evaluation of psychiatric community services - Selected papers on psychotherapeutic process and outcome research - Selected papers on training of professionals.