This chapter summarizes how Strategy’s practices have become gradually more open and inclusive since the middle of the last century. In particular, it underlines how the development of first strategic planning, then strategic management, and then open strategy have resulted from the institutional work of innovators from such prominent corporations as General Electric and Red Hat, and from leading consulting firms, particularly BCG, Bain, McKinsey, Gemini, GBN, and Strategos. This work has been influenced both by the exogenous forces of organizational, cultural, and technological change, and by the structural weakness of the Strategy profession, particularly its precariousness and permeability. The chapter proposes lessons for future practice change in Strategy, and develops implications for Strategy professionals, for policy-makers, for researchers, and for teachers. The book concludes by arguing for the benefits of open strategy not just for organizations and their immediate stakeholders, but for society as a whole.