No study has investigated delays of reinforcement of more than 30 seconds in the classroom. Yet many classroom delays exceed 30 seconds. A study designed for a four-way analysis of variance investigated (a) delays of reinforcement of 0, 5, and 15 minutes; (b) returning test stimuli before reinforcement versus not returning test stimuli; (c) primary versus intermediate grade range; and (d) trials. Subjects were educable retarded students in public schools. All main effects were found to be significant as well as the interaction between range (c) and procedure (b), and delay (a) and procedure (b).
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