Internal auditing is one of the most routine improvement tools available to organizations. In fact, it’s so ordinary that auditors sometimes forget the underlying principles of auditing. Auditors must be periodically reminded of these underlying truths or the entire audit process can begin to backfire. Keep these in mind as you audit and you’ll nearly always be successful. Principle 1: The customer of the internal audit is the one being audited
That’s right, the people you’re auditing are your customers. Internal auditing is a service you perform to help make your organization more successful and identify problems before they spiral out of control. The quality of your product depends on how well the audit is planned, the type of training provided to auditors, the level of engagement of top management and the way auditors behave during the audit, among other factors. You must conduct the audit with the same level of professionalism and diplomacy as if you were being paid by an outside party.
Little things that indicate the auditors have forgotten who the customer is include:

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