Contingencies of Reinforcement. Chapter 4: The experimental analysis of behavior. Quote 17 Post author:B. F. Skinner Foundation Post published:April 23, 2018 Post category:Skinner's Quote of the Day “An operant must behave like one; it must undergo orderly changes in probability when independent variables are manipulated.” (p. 89) Subscribe to RSS feed here You Might Also Like Contingencies of Reinforcement. Chapter 8: Behaviorism at fifty. Quote 23 September 4, 2018 About Behaviorism, Chapter 3: Innate Behavior, Quote 9 March 21, 2017 About Behaviorism, Chapter 5: Perceiving, Quote 7 April 24, 2017