William T. Powers
In November 1991, Bill Powers graciously accepted my invitation to fly from Durango to Los Angeles to attend my first one-day program introducing what we now call Perceptual Control Theory, PCT. He also graciously abstained from too much detailed critique of my performance. The next morning, before I took him back to the airport, Bill sat down to compose what he thought might be a more effective introductory summary of what PCT is all about. Here is what he wrote. The original is reproduced on the following page.