How Did Skinner Really Give Feedback?

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In addition to his interest and career in psychology, Skinner became interested in education and teaching after attending one of his daughter's math classes at Cambridge in 1953. He observed that the students did not receive immediate feedback concerning their performance, and that some students struggled to complete the problems while others managed to complete them quickly but did not truly learn anything. With these observations, Skinner built a machine that gave feedback, whether their answer was correct or not after every question. Skinner cut up manila folders and fashioned them into a sort of sliding machine. Math problems were printed on cards and placed into the machine. The correct answer turned on a light in the card. Years