Donald Schon (1930–1997) was a professor at MIT and a major theorist of professional practice and organizational learning. His most influential book, "The Reflective Practitioner" (1983), argued that the dominant model of professional knowledge — applying scientific theory to practical problems — misrepresents how skilled practitioners actually work. Professionals in complex, uncertain situations engage in "reflection-in-action": improvising, experimenting, and revising their understanding in the midst of practice itself, not just before or after. This framing challenged the assumption that expertise means possessing the right answers and redirected attention toward learning as an ongoing, situated process.
Schon's long collaboration with chris-argyris produced "Organizational Learning" (1978) and "Organizational Learning II" (1996), the theoretical bedrock of the field. Their joint framework of theories-in-use, espoused theories, and single- versus double-loop learning shaped how practitioners and researchers thought about institutional change. Schon contributed the phenomenological and philosophical dimensions of this framework — the attention to how practitioners construct meaning in real-time — while Argyris contributed the social-psychological analysis of defensive behavior.
peter-senge absorbed Schon's emphasis on learning through practice, not just through instruction, into the design of the fieldbook series. fifth-discipline-fieldbook-1994 is structured around exercises, reflection tools, and practice disciplines precisely because Senge accepted Schon's argument that conceptual understanding alone does not change behavior. The idea that the five disciplines are "disciplines" — ongoing practices requiring sustained cultivation, not skills acquired once — owes much to Schon's framing of professional expertise as a form of continuous reflective practice.