Abstract
A comparison was made of 2 techniques for teaching instruction-following to severely retarded children. The design consisted of a cross-over design involving a cross-over of techniques for each of the 3 subjects. Within the experiment condition the instructions were presented by physically preventing the subject from making an incorrect response, i.e., interrupting an incorrect movement. The results were in favor of the experimental condition in comparison with a trial-and-error approach. The data obtained in this investigation provide further evidence for the notion of errorless-discrimination learning.

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