Over the last week, 3ie staff in Delhi, London and Washington were busy coordinating conference logistics, finalising the conference programme, figuring out how to balance 3ie publications and clothing in their suitcases, and putting the last touches to their presentations. This is usual conference preparation for a conference that is going to be different. Why is this conference different? The participant mix – more than 500 people – is balanced among policymakers, programme managers and implementers, and researchers.