. The psychology of learning; an advance text in educational psychology . increase in efficiencydue to practice. It is customary to indicate the succes-sive practices on the horizontal axis, as BC in Fig. scale for the scores is indicated on the vertical axis,AB. The scores are shown by the dots above the num-bers on BC which represent the successive line DE joining these dots is the learning rise indicates the increasing efficiency due to prac-tice. Another method of constructing the curve is shownin Fig. 2. The curve is constructed as follows: In-stead of repres
. The psychology of learning; an advance text in educational psychology . increase in efficiencydue to practice. It is customary to indicate the succes-sive practices on the horizontal axis, as BC in Fig. scale for the scores is indicated on the vertical axis,AB. The scores are shown by the dots above the num-bers on BC which represent the successive line DE joining these dots is the learning rise indicates the increasing efficiency due to prac-tice. Another method of constructing the curve is shownin Fig. 2. The curve is constructed as follows: In-stead of representing successive practices by points onthe base, we represent them by successive scores are represented by horizontal lines, drawn atthe proper height and of the same length as the dist-ances on the base which indicate the practices. Eitherof these forms of curve shows the facts as well as theother, but if curves are to be dra\^Ti with the sameaxes for purposes of comparison, the form of curveshown in Fig. 1 is more convenient. [16] THE LEARNING CURVE 17. Figure 1. Learning Curve. Card-sorting, fifteen boxes, live cardsto the box, experiment continued five days, four sortings first day,eight sortings on each succeeding day, 12 subjects. Every sixthrecord is taken for the construction of the curve. The records arein terms of cards sorted per minute. />^z. ^ / 2 3 4 5 6 7 C Figure 2. Learning Curve. Data same as for Figure 1. 18 THE PSYCHOLOGY OF LEARNING In figures 1 and 2, increasing efficiency is shown by^ rise in the curves. The curves indicate the amountsof work done in successive equal periods of time. An-other method of constructing the curve is to show theamount of time required to do successive equal amountsof work. By this method, increasing efficiency is shownby a fall in the curve. It may be illustrated by the samecard-sorting data used in constructing the graphs infigures 1 and 2. In the card-sorting experiment fromwhich this data was obtained, seve
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