RT Journal Article SR Electronic T1 Defining Outcome Measures for Psoriatic Arthritis: A Report from the GRAPPA-OMERACT Working Group JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 697 OP 700 DO 10.3899/jrheum.170150 VO 44 IS 5 A1 Alexis Ogdie A1 Maarten de Wit A1 Kristina Callis Duffin A1 Willemina Campbell A1 Jeffrey Chau A1 Laura C. Coates A1 Lihi Eder A1 Musaab Elmamoun A1 Oliver FitzGerald A1 Dafna D. Gladman A1 Niti Goel A1 Jana James A1 Umut Kalyoncu A1 John Latella A1 Chris Lindsay A1 Philip J. Mease A1 Denis O’Sullivan A1 Ingrid Steinkoenig A1 Vibeke Strand A1 William Tillett A1 Ana-Maria Orbai YR 2017 UL http://www.jrheum.org/content/44/5/697.abstract AB The Group for Research and Assessment of Psoriasis and Psoriatic Arthritis (GRAPPA)-Outcome Measures in Rheumatology (OMERACT) Psoriatic Arthritis (PsA) Core Set working group recently published the updated 2016 psoriatic arthritis (PsA) core domain set, a set of disease features that should be measured in all clinical trials. At the GRAPPA annual meeting in July 2016, the PsA working group presented the updated PsA core domain set endorsed by 90% of participants at OMERACT in May 2016 and drafted a roadmap for the development of the PsA core outcome measurement set. In this manuscript, we review the development process of the PsA core domain set and the ongoing and proposed work streams for development of a PsA core measurement set.