Evaluating social impact bonds: questions, challenges, innovations, and possibilities in measuring outcomes in impact investing

Against a backdrop of economic turbulence and fiscal austerity, governments in the advanced economies are increasingly testing social impact bonds (SIBs) as a way of supplementing the public financing of social programs. SIBs are part of the emerging impact investing industry, where investors aim to achieve social or environmental objectives, as well as financial returns. As more SIBs move into execution, there is a need for independent evaluations of their outcomes and impacts that promote both accountability and learning, interrogate theories of change, and engage beneficiary stakeholders. Community development professionals should learn more about SIBs, explicate the relationships among individual, household, and community results, and support communities in holding SIB investors and sponsors to account for their declared intentions and outcome targets.