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Given scarce resources for evaluation, we recommend that education researchers more frequently conduct comprehensive randomized trials that generate evidence on how, why, and under what conditions interventions succeed or fail in producing effects. Recent experience evaluating a randomized need-based financial aid intervention highlights some of our arguments and guides our outline of the circumstances under which the examination of mechanisms and heterogeneous impacts is particularlydoi:10.1162/edfp_a_00060 fatcat:y7fhpx35bfa6hehvlzpjr5cxvq