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[The following paragraph was effective for periods ended on or after June 25, 1983. It was amended, effective for audits of fiscal years beginning on or after December 15, 2010. See PCAOB Release No. 2010-004.

Return to the current version.]

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In some circumstances the auditor may design a sample that will be used for dual purposes: assessing control risk and testing whether the recorded monetary amount of transactions is correct. In general, an auditor planning to use a dual-purpose sample would have made a preliminary assessment that there is an acceptably low risk that the rate of deviations from the prescribed control in the population exceeds the tolerable rate. For example, an auditor designing a test of a control procedure over entries in the voucher register may plan a related substantive test at a risk level that anticipates an assessment level of control risk below the maximum. The size of a sample designed for dual purposes should be the larger of the samples that would otherwise have been designed for the two separate purposes. In evaluating such tests, deviations from pertinent procedures and monetary misstatements should be evaluated separately using the risk levels applicable for the respective purposes.