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This paper attempts a preliminary comparison of the rate of learning when all possibility of error has been eliminated by means of some extraneous control, as opposed to the usual procedure of learning by the trial and error process. The two methods may be termed 'controlled' and 'free or undirected' learning respectively. The nature of the problem may be more adequately comprehended after a descriptive account of the apparatus and the mode of procedure. A diagram of the problem box is given indoi:10.1037/h0075151 fatcat:empzb67cobhqvkymr65j6j5lpq