Objective. To examine prospective relations between a wide array of measures of social functioning and pain, while controlling for disease duration and activity and functional grade. Methods

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By application of a standardized core set of outcome measurement instruments, comparison between studies as well as meta-analyses in rehabilitation research can be facilitated. The German Society for Rheumatology has commissioned its working group on rehabilitation with the development of a proposal for such a core set of outcome measurement instruments. In a first step, dimensions for outcome measurement in rehabilitation were defined by a group of experts which represented rehabilitation hospitals, acute care hospitals, and research groups specialized in outcome measurement. The Delphi method was used in a multiple step consensus process. In a second step, instruments and procedures to operationalize the relevant dimensions were chosen. Reliability, validity, sensitivity to change, and practicability were used as criteria for selecting measurement instruments. The main intention of the proposed core set of outcome measurement instruments is to facilitate the processes of planning and carrying out rehabilitation research studies. Furthermore, the proposed instruments can be used for clinical documentation systems as well as for internal or external quality assurance programs.