A Terminal Evaluation of the IDB/UNEP/GEF project ‘Testing a Prototype Caribbean Regional Fund for Wastewater Management’ (the IDB/UNEP/GEF CReW project) has been undertaken, consistent with the expectations of the GEF, IDB and UNEP. The purpose of the Terminal Evaluation is to enable the GEF Agencies (IDB and UNEP), the countries1 and other stakeholders: i) to assess the achievement of the project against the expectations of the Project Document endorsed by the GEF CEO; ii) to draw lessons that can both improve the sustainability of the benefits from this project; and, iii) to aid IDB and UNEP with the development of follow-on project to up-scale the CReW.