Audits are performed to ascertain the validity and reliability of information; also to provide an assessment of a system's internal control. The goal of an audit is to express an opinion on the person / organization/system (etc) in question, under evaluation based on work done on a test basis. Due to practical constraints, an audit seeks to provide only reasonable assurance that the statements are free from material error. Hence, statistical sampling is often adopted in audits. In the case of financial audits, a set of financial statements are said to be true and fair when they are free of material misstatements - a concept influenced by both quantitative and qualitative factors.
Traditionally, audits were mainly associated with gaining information about financial systems and the financial records of a company or a business (see financial audit). However, recent auditing has begun to include other information about the system, such as information about environmental performance. As a result, there are now professions conducting environmental audits.
It is performed by competent, independent and objective person(s) known as auditors or accountants, who then issue an auditor's report based on the results of the audit.
This is part of certifications such as ISO 9001. Quality audits are essential to verify the existence of objective evidence of processes, to assess how successfully processes have been implemented, for judging the effectiveness of achieving any defined target levels, providing evidence concerning reduction and elimination of problem areas and are a hands-on management tool for achieving continual improvement in an organization.
Such an audit is called an integrated audit, where auditors have the additional responsibilities of expressing opinions on the management's assessment of the firm's internal control and the effectiveness of internal control over financial reporting, based on their (the auditors') own assessment.
Source: Wikipedia > Audit
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