Via Colm, a US Government Accountability Office report on methods for programme evaluation.
link here
The report is positive about the use of RCT's, deeming them ethical and feasible under certain conditions but overall concludes:
"GAO concludes that (1) requiring evidence from randomized studies as sole proof of effectiveness will likely exclude many potentially effective and worthwhile practices; (2) reliable assessments of evaluation results require research expertise but can be improved with detailed protocols and training; (3) deciding to adopt an intervention involves other considerations in addition to effectiveness, such as cost and suitability to the local community; and (4) improved evaluation quality would also help identify effective interventions."
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