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A major purpose of the study was to assess the relative effects of group versus individually contingent free time in modifying student behaviors. Other purposes were to determine the effectiveness of well-planned lesson activities and tokens without back-up reinforcers. Eight students in an inner-city seventh-grade class of 32 blacks served as subjects. Well-organized lesson activities and success feedback via tokens did not produce high levels of desirable behavior. In contrast, group and individually contingent free time produced substantially higher levels of appropriate behavior than did the baseline conditions. The group reinforcement procedure appeared to be slightly more effective than individual reinforcement.
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Long et al. (1973) studied this question.
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