a group within OMERACT that is primarily dedicated to the methods and processes used to develop, validate, and implement Core Outcome Sets (COS). Rather than focusing on a specific disease or outcome domain, these groups work on improving the rigor, consistency, and transparency of OMERACT’s methodologies — ensuring that all Core Outcome Sets are developed according to best practices and are fit for regulatory, clinical, and research use.
Example
The Composites Working Group is an OMERACT Methodology Working Group Theme. Instead of targeting a single disease, it focuses on the development and evaluation of composite outcome measures — instruments that combine multiple domains (e.g., pain, function, disease activity) into a single score. The group develops guidance on how to weight and validate these composite measures so that other OMERACT groups can apply consistent methods when creating or endorsing composite outcomes.