A note for CGD with Euan Ritchie and Lee Robinson. This paper argues there is a (fuzzy) spectrum of development procedures, for some of which global innovation, evaluation, or “best practice” can be informative, for some of which local evaluation or experimentation can be useful, and for some of which perhaps only practical experience and local wisdom can help. That there is a spectrum of intervention types and research opportunities, and that local evidence is often required, has implications for the kind of research that UK aid can usefully support as part of its R&D program and where that research should happen. In turn, that suggests a reform agenda for the way UK ODA for R&D is currently spent.