Few concepts have captured the imagination of the conflict and development community in recent years as powerfully as the idea of a 'political settlement'. At its most ambitious, 'political settlements analysis' (PSA) promises to explain why conflicts occur and states collapse, the conditions for their successful rehabilitation, different developmental pathways from peace, and how to better fit development policy to country context. Yet not all is well in the world of PSA. Rival definitions of the term abound, there are disagreements about its scope and the way it should be used, a growing schism between conflict specialists and economists, basic concepts are ambiguous and little progress has been made on measurement. Political Settlements and Development consequently has three main aims: to argue for a revised definition of a political settlement, capable of unifying its diverse strands, and opening new opportunities for the analysis of conflict and development; to put the concept on a more solid theoretical and scientific footing, providing a method for measuring and categorising political settlements, while using new data to analyse the relationship between political settlements and development; and finally, to examine the implications for policymakers. This is an open access title available under the terms of a CC BY-NC-ND 4.0 International licence. It is free to read at Oxford Scholarship Online and offered as a free PDF download from OUP and selected open access locations.