Standard methods of impact evaluation often leave significant gaps between what we know about development effectiveness and what we want to know—gaps that stem from distortions in the market for knowledge. The author discusses how evaluations might better address these knowledge gaps and so be...

The consensus among scholars and policy-makers that 'institutions matter' for development has led inexorably to a conclusion that 'history matters', since institutions clearly form and evolve over time. Unfortunately, however, the next logical step has not yet been taken, which is to recognise...