This chapter aims to outline a process of school collaboration with peer review at its heart, conceived at UCL Institute of Education by David Godfrey and piloted by the authors for the first time in 2016/17 in London. We outline some of the learning that has resulted for participating school staff and reflect on what we have learned as facilitators and evaluators of Research-informed Peer Review (RiPR). The chapter looks at the principles and theories that underpin RiPR and its relationship to other research-practice models. We present findings from follow up surveys two years since completing the first RiPR cycle, and apply additional learning from its implementation and adaptation in Chile (see also Chap. 7). Finally we look at how evaluation theory is linked to evaluation policy in this model and on the potential impact of RiPR on teacher collective efficacy