User and community co-production of public services: what does the evidence tell us?

Much of the current discussion of user and community co-production makes strong claims for its potential to improve outcomes. How much is actually known about the level, drivers, and potential effects of co-production? In this article, some of the key claims made for co-production are examined and an assessment is made of how they stack up against the empirical evidence. In particular, some areas are identified in which practice must be cautious about the potential contribution of co-production, and where further research is needed.