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I developed and implemented the prelabs to replace time-inefficient prelab lectures and to encourage greater student independence. Students completed the on-line prelabs before the beginning of their lab period. The prelabs consisted of text and graphical tutorials, interactive instrument tours, and multiple-choice questions. Student and instructor perceptions indicate that the prelab assignments helped prepare students for their lab work. The overall effectiveness of the prelabs depends on students taking primary responsibility for their preparation and outcomes in lab.