Recent Issues. Chapter 12: The Behavior of Organisms at Fifty. Quote 6 Post author:B. F. Skinner Foundation Post published:April 8, 2019 Post category:Skinner's Quote of the Day “Rate of responding has proved, in fact, to be a highly useful dependent variable. In a later paper I could report that it varied usefully over a range of at least 600 to 1.” (pp. 123-124) You Might Also Like Recent Issues. Chapter 3: The Initiating Self. Quote 3 December 4, 2018 Contingencies of Reinforcement. Chapter 9: The inside story. Quote 21 October 3, 2018 Science and Human Behavior, Chapter 5: Operant Behavior, Quote 8 March 1, 2016