Westat and Horizon Research, Inc., are conducting a three-year evaluation of the Research and Evaluation on Education in Science and Engineering (REESE) program in the National Science Foundation's Division of Research and Learning. Using a multi-method approach the evaluation is examining the following questions: - To what extent is the REESE program catalyzing discovery and innovation in research in STEM learning, education, and evaluation? - How effective is the REESE program in stimulating STEM fields to produce high-quality, rigorous research studies? - How effective is the REESE program in supporting the accumulation of knowledge in STEM education? - How effective is the REESE program in promoting interdisciplinary research addressing questions of STEM teaching and learning? The presentation will present Westat's approach for evaluating this program, including challenges and how they are being addressed. #GovernmentEvaluation #ResearchonEvaluation #STEM #2011Conference