The fourth edition now incorporates materials related to the conduct of an audit of internal control over financial reporting as required by Sarbanes–Oxley. These materials cover internal control analysis, testing, and evaluation, as well as reporting requirements. As in the past, the audit is segmented into business processes. For flexibility in assigning materials, exercises related to the audit of internal control are optional. These exercises can be assigned as time permits. The case is flexible enough to accommodate just a financial statement audit.