Perceptual Control TheoryA Model for Understanding theMechanisms and Phenomena of Control December 24, 2011 WM Bill Powers, Method of Levels, Papers, Psychology & Mental Health William T. Powers, Bruce Abbott, Timothy A. Carey, David M. Goldstein, Warren Mansell, Richard S. Marken, Bruce Nevin, Richard Robertson, & Martin Taylor (2011) PCTUnderstanding-1Download