This policy report is a supplement to the CoAct Policy Brief (CoAct deliverable 2.5) and provides policymakers, civil society organisations and research performing institutions with more details on the recommendations on how to use Citizen Social Science to support and shape social change. It offers an introduction to the approach and lays out the benefits and challenges experienced. It is based on the outcomes of the international research project CoAct funded by the European Union that implements and reflects participatory research methods and their impacts in different settings and regions.