... million,according to the 2001 survey.8 The Role of the IS Auditor The role of audit in computerized information systems is vital to the continuing welfare of the organization. The high cost of investing ... investigations 3 ,50 1—4 ,50 02. General probity audits 4 ,50 1 5, 5003. Fraud investigations 5, 501—6 ,50 04. Other investigations 6 ,50 1—7,000C. Consultancy services 7,001—8,000D. Audit professional advice ... checking whether the controls are robust and complied with.178 THE ESSENTIAL HANDBOOK OF INTERNAL AUDITING [1] Initial terms of reference for the work• Key manager briefing and discussions on the review.•...