Chick Spinney, one of John Boyd’s closest associates, has revised his flow diagram depicting how Boyd’s strategic thinking evolved from his days flying F-86s in Korea in 1953 until his death in 1997.
In this chart, “ODA” is “orient-decide-act,” not “observe-decide-act.” As Chuck recalls, Boyd added “observation” in 1975, about the time he retired from the Air Force. “LWF” is the Air Force’s Lightweight Fighter program, which culminated in the flyoff between the YF-16 and YF-17 in 1974.
Note that Patterns of Conflict is about operating inside the OODA loop and says virtually nothing about the OODA loop itself. The only place Boyd develops — and draws — the OODA loop is in The Essence of Winning and Losing, 1996.
Chuck also highlights how Boyd returns to “Scientific/Philosophical Foundation Efforts” with Conceptual Spiral in 1992. Interesting to compare the two, the effects of 16 years of intense effort.
All of Boyd’s works, and a PDF of the above diagram, are available from our Articles page. I might also modestly recommend my “Origins of John Boyd’s Discourse,” which illustrates some of the domains Boyd investigated (e.g., evolution, complexity, Clausewitz, Sun Tzu, etc.) as he moved along Chuck’s progression.