This pilot guide is intended to help evaluation managers to commission and oversee, and team leaders to conduct, RTEs of humanitarian operational responses. Drawing on a synthesis of existing good practices, it sets out a flexible approach that can be adapted to a variety of contexts. While it concentrates on the particular problems posed by RTEs undertaken within a few months of the start of an emergency response, it addresses how such RTEs can also feed into on-going operations. While the guide focuses on RTEs, some of the advice applies to all evaluations.