Improved diagnostic techniques have led to better identification of the risk factors for first developing anxiety disorders, secondary psychosocial disability, and psychopathological complications. This chapter reports the preliminary findings of the baseline investigation of a random population sample of 3021 people, aged 14-24, and conducted in the greater Munich area, Germany, in 1994. The data were collected as part of the baseline investigation of the Early Developmental Stages of Psychopathology (EDSP) study funded by the German Ministry of Research and Technology. The psychometric properties of the Munich Composite International Diagnostic Interview (M-CIDI) have been investigated by studying various sites and samples. This assessment module is specifically tailored to the characteristics of mental health care in Germany, taking into account the specific characteristics of the Munich area. A clinician's evaluation of need is heavily dependent on the evaluator's professional background and experience, their knowledge and attitudes towards such disorders.