This document discusses the different stages of an audit process and contents of audit working files. The key stages are client acceptance/retention, audit planning, test of controls, substantive procedures, and opinion formulation. Client acceptance involves evaluating independence and compliance with ethical standards. Audit planning establishes strategy and detailed plans. Tests of controls evaluate internal controls, while substantive procedures detect material misstatements. Upon completing these stages, an audit opinion is formulated. Audit completion procedures then ensure sufficient evidence was obtained. Audit working files contain planning, control, procedure, program, and permanent files documenting the audit work.