SA 230 Audit Documentation – Standards on Auditing
Audit documentation serves a number of purposes, including the following
1) Evidence of the auditor’s basis for a conclusion about the achievement of the overall objectives of the auditor
2) Evidence that the audit was planned and performed in accordance with SAs
3) Assisting the engagement team to plan and perform the audit.
4) Assisting members of the engagement team responsible for supervision to direct and supervise the audit work, and to discharge their review responsibilities in accordance with SA 220.