OMERACT Working Groups are collaborative teams advancing the science of outcome measurement in rheumatology and musculoskeletal health. Each group focuses on a specific disease, domain, or methodology—working together to develop and gain community endorsement of Core Outcome Sets that ensure research is scientifically sound and meaningful to patients.

OMERACT follows a bottom-up, consensus-driven process. Ideas for new Working Groups emerge from the community—clinicians, researchers, methodologists, and patient research partners (PRPs) who identify unmet needs in outcome measurement. Once formed, each group follows a structured pathway outlined in the OMERACT Handbook, which ensures rigour, transparency, and comparability across all projects.