This paper gives an overview of the most important German-language diagnostic instruments suitable for use in schizophrenia. The procedures are implemented in different phases of the disorder, depending on the nature of questions involved. In addition to clinical interviews for diagnostic classification, self-rating and observer rating scales of psychopathological symptoms are presented. The procedures described take into account psychotic phenomena (e. g., delusions, hallucinations) as well as quality of life, insight, and social consequences of the disorder.