Participatory evaluation has set the standard for cooperation between program evaluators and stakeholders. Coalition evaluation, however, calls for more extensive collaboration with the community at large. There are many different labels for participatory evaluation, however not one specific to coalition work. This article describes Community-Based Participatory Evaluation CBPE, takes time, money and skilled personnel but can lead to more accurate results and coalition sustainability. Recommendations on how foundations and grantee organizations interested in coalition work should fund CBPE are discussed.