The necessity for a standardized documentation system for the complementary sector of psychiatric care is pointed out, and the goals and requirements to be met are debated. The test-version of such a documentation system (abbrev. BADO-K) is shown. It consists of modules for the assessment of client-centered data, and for the documentation of the treatment process in various facilities. Furthermore, a module of questionnaires and instruments for assessing outcome variables (e.g. quality of life) is integrated. The principles for using the paper-pencil-version and the EDP-version are outlined and discussed with regard to the legal regulations concerning the protection of personal data. Finally, possibilities and limitations of the presented documentation system are discussed. It is argued that the BADO-K is an useful instrument for evaluating the process and outcome of community psychiatric care.