Third-party interventions play a key role in efforts to boost development, to avoid conflict and in rebuilding societies in the aftermath of violence. Whether or not these interventions perform as intended, and whether or not they have other unintended impacts, are key questions for both academic and policy audiences. Yet, more often than not, interventions are evaluated, only, against scale and spending targets. ISDC contributes key knowledge to this debate in conflict-affected and fragile areas and humanitarian emergencies, through the use of experimental and quasi-experimental methods, focussed on a range of intentional and unintentional outcomes, including peace, food security, nutrition and employment. Often working in partnership with local partners, we design rigorous impact evaluations, develop appropriate methods, collect and analyse the necessary data and assist our stakeholders to absorb and act on the findings.