In order to enhance and refine myositis outcomes, an initiative called the IMACS Outcomes Repository has been established. This initiative, which is supported in part by a grant from the American College of Rheumatology, will allow for data collected in prospective clinical trials and observational studies to be pooled for prospective validation of the Preliminary Definitions of Improvement as Myositis Response Criteria, and future development of novel outcome measures. The database for this repository has been completed and the repository is open for submission of trials and natural history studies. For further information, contact the IMACS coordinators.