Verification of the legality and regularity of the implementation of resources. Auditing makes a judgment in terms of general criteria and standards. The main purpose of an audit is to find mistakes and evidence of dysfunction. The idea is to obtain a dissuasive effect. With time, the terms ‘control’ and ‘audit’ have extended further a field to encompass more activities than those corresponding to the original definition. The objective of an audit (i.e. an assurance engagement) is for an auditor to evaluate, and to express a conclusion (i.e. opinion) that provides the intended user with a level of assurance about that subject. In other words: auditing is measuring facts and reporting a conclusion.