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Registries and cohort studies play a central role in patient-oriented medical research, in particular in health services research. In order to increase the transparency about ongoing registries and cohort studies in Germany, and to promote communication and cooperation between the drivers in the field a so-called register portal should be established. Metadata are characteristics that are used to describe registries and cohort studies in the register portal. A limited set of characteristics, the core set, should correctly describe the projects on the one hand while reducing workload for data capture and data administration on the other hand. The core set consists of 26 data elements that had been defined in a Delphi-consensus process involving experts from the working group registries of the German Network for Health Services Research (DNVF) and the working group IT infrastructure and quality management of the Technology, Methods, and Infrastructure for Networked Medical Research (TMF). Transparent policies are required to guarantee traceability and reliability of the portal's services. Six so-called top-level-tasks and 37 use cases were defined in an interim report so far. The metadata have been agreed upon by most of the member associations of the DNVF. Metadata and rules of procedures are the starting point for the practical implementation of the register portal in the next future., (© Georg Thieme Verlag KG Stuttgart · New York.)

On August 30, 2010, the German Network for Health Services Research [Deutsches Netzwerk Versorgungsforschung e. V. (DNVF e. V.)] approved the Memorandum III "Methods for Health Services Research", supported by their member societies mentioned as authors and published in this Journal [Gesundheitswesen 2010; 72: 739-748]. Registries in Health Services Research vary in their aims and research questions as well as in their designs, methods of data collection, and statistical analyses. This paper aims to provide both a methodological guideline for developers to ensure a high quality of a planned registry and, to provide an instrument for users of data from registries to assess their overall quality. First, the paper provides a definition of registries and presents an overview of objectives in Health Services Research where registries can be useful. Second, several areas of methodological importance for the development of registries are presented. This includes the different phases of a registry (i. e., conceptual and preliminary design, implementation), technical organisation of a registry, statistical analysis, reporting of results, data protection, and ethical/legal aspects. From these areas, several criteria are deduced to allow the assessment of the quality of a registry. Finally, a checklist to assess a registry's quality is presented., (© Georg Thieme Verlag KG Stuttgart · New York.)