One out of ten startups is successful. The Lean Innovation approach improves the success rate of Startups. Entrepreneurs and Investors learn earlier what works and what does not and hence can act faster. Lean Innovation starts to unfold its potential from the early stage of a Startup even long before it has a sellable product. However, just using the tools does not result in increased effectiveness. Lean Innovation requires a fundamental mindset change of Entrepreneurs and Investors: Away from unproven assumptions to facts through creative experiments. In this training we show the essentials of the lean innovation framework and which aspects and metrics you the investor should request from the Entrepreneurs to make sure the Startup measures real progress daily and continuously adapts the path forward based on their latest learning to generate more value in shorter time. As an introduction we recommend to read the Harvard Business Review article ”Why the Lean Start-up Changes Everything”.