Social return on investment (SROI) is a way to measure the impact that something has on people and the environment. It starts by asking questions such a: What are the positive and negative impacts that a project has on people? What kind of difference can it make in their lives?
To figure out the SROI, you look at the amount of money invested in the project, then look at all the benefits it brings to people and the environment. When you compare the amount of money invested with the number of people whose lives are changed for the better, you can work out the SROI. A high SROI means that the project has made a big difference and was worth the money. A low SROI means that maybe the project wasn't worth the money invested.