Genevieve Maitland Hudson (Osca) and Bethia McNeil (The Centre for Youth Impact) reflect on the Shared Measurement seminar held on the 10th of September 2015 with the involvement of New Philanthropy Capital. The seminar explored the implications of shared measurement for social programmes. More, and increasingly public, measurement seems to be inevitable. We discussed what that means for social programmes, and how different participants can play an active part in defining the rules of the game. Or be left out. Speaking at the event were Genevieve Maitland Hudson of Osca, Tris Lumley of NPC and Bethia McNeil of The Centre for Youth Impact.