<p>Evidence base by case.</p>

This paper offers a reflective, practice-based synthesis of two decades of co-created research, policy engagement and advocacy at the African Population and Health Research Center (APHRC).We define co-creation through four dimensions; shared agenda setting, joint knowledge production, power sharing, and community leadership and ownership.

We distinguish it from consultation, stakeholder engagement and partnership, and assess each dimension on a graded scale. To this we add a second axis: the reach of co-creation across the research-to-policy-to-advocacy interface, and the condition of the transitions between its segments. Six cases spanning evidence generation, policy processes, capacity strengthening and rights-based advocacy are assessed against both axes.