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In three experiments using crossover designs, we investigated the effects of Classroom Response Systems (CRS) when presenting multiple-choice questions in real classrooms. In Experiment 1, students either used CRS for bonus points or simply saw the questions. There were no differences on a unit exam. In Experiment 2, students were told prior to a unit that they would either use CRS for course credit or no credit. Students using CRS for credit performed better on pre-lecture questions and a unit exam. In Experiment 3, students used CRS to answer pre-lecture questions for course credit or no credit. Students using CRS for credit again performed better on a unit exam. CRS appear to enhance learning when they encourage student accountability and increase readiness for lectures.Large lecture classes are not uncommon in many American universities today. Despite some calls to eliminate these large classes, more universities may be considering increasing class sizes due to challenging economic times (Krueger,

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