Recent advances in biologic therapies have provided hope for patients with psoriatic arthritis (PsA). However, studies have been hampered by the lack of acceptable and validated outcome measures. This article reviews outcome measures used in the assessment of both skin and joints in PsA, and provides a summary of the Psoriatic Arthritis Workshop during OMERACT 7. A set of domains to be included in the assessment of patients with PsA was derived, and a research agenda was developed.