Impact First: the social entrepreneur's guide to measuring, managing and growing your impact is a guide with step by step actions and much more, for you to successfully measure, manage and communicate your impact. Based on the Lean Social Impact Approach, that Heidi uses with her clients, it takes impact measurement from a complicated, time consuming process to a lean and simplified process. The book covers the underlying principles of impact measurement and management; how to get clear on why you are doing impact measurement; how to define your organisation's ultimate goal; developing a theory of change; how to measure social, community, economic, environmental and tech impacts; methods for measuring impact including surveys and other alternatives; how to analyse and learn from your impact data; creating impact metrics for your staff team and your board; Social Return on Investment (SROI); impact measurement in times of crisis; and the future of impact measurement and management.