The aim of the evaluation and impact assessment activities in the CoAct project has been twofold. On the one hand, a process-oriented view should help to reflect on how the participatory research process is implemented across all relevant stakeholders and what can be learned and adapted from the collected feedback and insights. This formative evaluation led to insights on the Citizen Social Science co-research process as well as drivers and drivers for participation. Concrete findings have been discussed regularly in the project consortium and have been documented in detail in D7.2 (Kieslinger et al. 2021). On the other hand, the impact assessment activities - or summative evaluation - were aimed to bring evidence of the impact that the project’s Citizen Social Science activities have on the involved actors, such as Co-Researcher s, citizen scientists, Knowledge Coalition members, and professional researchers, as well as on their socio-cultural contexts, and the scientific discourse at large, in a collaborative and participatory manner. This document focuses on the latter, the impact achieved during the project and beyond. DISCLAIMER: The present Project Deliverable has been submitted to the European Commission for review. The information and views set out in this report are those of the author(s) and do not necessarily reflect the official opinion of the European Union. Neither the European Union institutions and bodies nor any person acting on their behalf may be held responsible for the use which may be made of the information contained therein.