This document discusses social impact measurement and SROI (Social Return on Investment). It provides an overview of Jennifer Rouse from New Economics Foundation and Luis Gorjon Fernandez from CAF who spoke on the topic. SROI is introduced as a way to understand the social, environmental and economic value created by investments. An example is provided of how SROI was used to measure the impact of a drug abuse support programme in Brazil. Stakeholder interviews and financial proxies were used to value outcomes such as employment, health improvements and family relationships. The analysis found the programme generated 2.67 Reais in social value for every 1 Real invested.