Paper presentation at AEA 2013 Conference. ABSTRACT: Developmental Evaluation (DE) requires the evaluator to assume a relatively new and unique role when compared to more traditional evaluation approaches. The DE role encompasses far more than the basics of data collection and analysis; the evaluator is integrally involved as a program team member, questioner, observer and facilitator throughout the program’s lifespan. This role has also been described as that of a “critical friend” who can challenge assumptions while drawing upon best practices and research, as well as understanding the implications of an intervention from a social and political perspective. Drawing from our experience as external evaluators of a foundation-funded initiative, this summary paper sheds some light on some of the challenges that can accompany this novel evaluator role. #developmentalevaluation #2013Conference #ProgramTheoryandTheoryDrivenEvaluation