"We seek to show how evidence-based teaching for management affects the success of firms by way of changing managers’ actions. We conducted a randomized controlled field intervention with a sample of 100 small business owners in Kampala, Uganda. The intervention increased personal initiative behavior and entrepreneurial success over a 12-month period after the intervention. An increase in personal initiative behavior was responsible for the increase of entrepreneurial success (full mediation). Thus, the training led to an entrepreneurial mind-set and to an active approach toward entrepreneurial tasks. This particular management training was successful at improving knowledge and intangible skills that translated into successful organisational medium- to long-run outcomes for small businesses."