1. 70's, A number of management theorists have contributed to the evolution of knowledge management Peter Drucker: information and knowledge as organizational resources Peter Senge: "learning organization" Leonard-Barton: well-known case study of "Chaparral Steel ", a company having knowledge management strategy 2. 80's, Knowledge (and its expression in professional competence) as a competitive asset was apparent 3. 90's until now, Knowledge management was introduced in the popular press, the most widely read work to date is Ikujiro Nonaka’s and Hirotaka Takeuchi’s The Knowledge-Creating Company: How Japanese Companies Create the Dynamics of Innovation (1995)