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The author has used frequent testing in all of his undergraduate classes for about twenty years. The version of frequent testing described here involves students facing a potential quiz almost every class; the quiz is on material covered in the previous class or an earlier class.  In this paper, a low-cost method of frequent testing is described.  The description includes details of things that resulted in the process being low cost.  Also, some things that were expected to be low cost, but turned out to be high cost, are pointed out.  Low cost is defined as two hours of the instructor's time per section per week.

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