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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.