https://docs.trr379.de/howtos/pool-tool/document-instruments/index.htmlTRR379 uses the knowledge pool to document research instruments and questionnaires, and to provide standardized identifiers that can be used when harmonizing data across sites. You can document an instrument at different levels. In particular, questionnaires can be documented as: the original instrument or questionnaire, a TRR379-specific version or variant, individual questionnaire items, and where useful, site-specific versions of an instrument or item. These records can be linked to one another to expose the relationships between the original instrument, TRR379 versions, and individual questionnaire items.Hugoen-us