Cumulative Record: Definitive Edition (1999). Chapter 7: Are Theories of Learning Necessary. Quote 12 Post author:B. F. Skinner Foundation Post published:May 28, 2021 Post category:Skinner's Quote of the Day Progress in a scientific field usually waits upon the discovery of a satisfactory dependent variable. Until such a variable has been discovered, we resort to theory. (p. 75) You Might Also Like Cumulative Record: Definitive Edition (1999). Chapter 5: “Man”. Quote 1 April 5, 2021 Contingencies of Reinforcement. Chapter 5: Operant behavior. Quote 6 May 22, 2018 Contingencies of Reinforcement. Chapter 1: The Role of the Environment. Quote 3 January 12, 2018