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The purpose of this RETA project is twofold: First, it will clarify and disseminate practical applications of research strategies that will convey the design benefits of randomized field trials; second, it will sharpen concepts that form the theoretical basis for randomized field trials. Key underlying concepts include the nature and limits of inferences that can be drawn from randomized field trials, and warranted reasoning about causal relations between educational interventions and learning outcomes. Project outcomes will add value to STEM education projects within the broad portfolio of the National Science Foundation, including projects within the Math-Science Partnership (MSP) program.