DOCTORAL PAPER Entrepreneurial success is multi-factorial. It can be the result of a manager's ability to develop a strategy and lead a team. It can also be the result of luck, of being in the right place at the right time in the right market. This apparent luck never comes around twice: the true measure of a strategist's ability is his ability to multiply successes and make them last over time. Our research project focuses on the recent creation of a small L family group, the fruit of an initial entrepreneurial success: company E1, which has been applying socio-economic management methods (Savall, 1974; Savall & Zardet, 1987) since 2015. A significant amount of hidden costs and performance have been recycled into added value. We are seeking to measure how, on the basis of generic strategic and operational skills, a second company, E2, a production company in sector S2, has been created and is developing from this very successful distribution company, E1, in sector S1.