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 Recent Issues. Chapter 8: The School of the Future. Quote 3 February 14, 2019 Contingencies of Reinforcement. Chapter 1: The Role of the Environment. Quote 18 February 2, 2018 Science and Human Behavior, Chapter 14: The Analysis of Complex Cases, Quote 1 August 9, 2016