This chapter provides an ethical framework that protects the evaluator and the participants whilst adding rigor and credibility to evaluations. We explore how a project that is process-driven can facilitate joint expectations from the outset and allow reflection and review. We argue that if commissioners and evaluators follow processes and regularly review expectations, then transparency, a key requirement of ethical evaluations, will follow. The chapter concludes by reflecting on the wider context of how evaluations that embed ethical principles can improve policy-making in health care.