The Health and Social Care Act 2012 gave the responsibility for commissioning primary care services to NHS England (NHSE). Part of the rationale for this was to move towards a more standardised model of primary care commissioning. However, it has become clear since 2010 that local flexibility and understanding is also required in order to properly match primary care provision to the needs of an aging population. Primary care co-commissioning was first mooted in the Call to Action in 2014, where “joint commissioning” was identified as one of national level supports to improve general practice. In May 2014, it was officially announced that CCGs would get ‘new powers’ under a new commissioning initiative. There are 3 levels of responsibility; (1) ‘greater involvement’ (where CCGs would have ‘influence’ but not take the lead in shaping primary care locally), (2) joint commissioning (where CCGs would set up a joint committee with NHSE AT), and (3) delegated authority (where CCGs would take over budgets from NHSE Area Teams and take the lead in primary care commissioning). Initially there was no clear expectation that CCGs would move from Level 1 and 2 to taking on full responsibility (Level 3) over time. However, one year on, CCGs operating at Level 1 and 2 were encouraged to consider applying for full delegation. This report aims to explore the uptake of primary care co-commissioning nationally, develop an understanding of the rationale underlying the policy and the expected outcomes, and understand the scope of co-commissioning activity and the process of change.