[The following paragraph was effective for audits of periods ending after December 15, 1991. It was amended by PCAOB Auditing Standard No. 2, effective for audits of fiscal years ending on or after November 15, 2004, for accelerated filers, and on or after July 15, 2005, for all other issuers. See PCAOB Release No. 2004-008
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Account-Balance or Class-of-Transaction Level
At the account-balance or class-of-transaction level, the auditor performs procedures to obtain and evaluate evidential matter concerning management's assertions. The auditor assesses control risk for each of the significant assertions and performs tests of controls to support assessments below the maximum. When planning and performing tests of controls, the auditor may consider the results of procedures planned or performed by the internal auditors. For example, the internal auditors' scope may include tests of controls for the completeness of accounts payable. The results of internal auditors' tests may provide appropriate information about the effectiveness of controls and change the nature, timing, and extent of testing the auditor would otherwise need to perform.