Cumulative Record. Chapter 12: The Science of Learning and the Art of Teaching. Quote 17

In a typical classroom, . . . long periods of time customarily elapse . . . Many seconds or minutes intervene between the child’s response and the teacher’s reinforcement. In many cases—for example, when papers are taken home to be corrected—as much as 24 hours may intervene. It is surprising that this system has any effect whatsoever. (p. 184)