Cumulative Record. Chapter 15: Reflections on a Decade of Teaching Machines. Quote 1 Post author:B. F. Skinner Foundation Post published:December 19, 2022 Post category:Skinner's Quote of the Day Those who have had anything useful to say [about teaching machines] have said it far too often, and those who have had nothing to say have been no more reticent. (p. 240) You Might Also Like Cumulative Record. Chapter 9: A Case History in Scientific Method. Quote 5 May 6, 2022 Cumulative Record. Chapter 11: Reinforcement Today. Quote 4 July 26, 2022 Contingencies of Reinforcement. Chapter 1: The Role of the Environment. Quote 33 February 23, 2018