Well designed indicators and measures of impact testify to the changes brought about by specific SSE initiatives, whether economic, social, environmental or cultural, and are a tool for persuading public bodies to support their work. They can also be used to clarify the objectives and evaluate the results of public policies, and as a result can highlight the comparative benefits of SSE initiatives. It is therefore strategically useful to develop measures of impact, both for local governments and for SSE organizations engaged in projects related to city development.