no / While the general argument that it is easier and more cost-effective to prevent conflicts before the outbreak of violence has considerable attraction, a rigorous approach to estimating the cost and benefits of this policy is still lacking. The objective of this study is to contribute to the development of such an approach. The project involves six case studies, three retrospective (the Western Balkans, Afghanistan, and Rwanda) and three prospective (Afghanistan, Uzbekistan and southern Sudan). Its main conclusion is that targeted programmes of conflict prevention are (or would have been) significantly cheaper than cure.