Audit

The most general definition of an audit is an evaluation of a person, organization, system, process, project or product. Audits are performed to ascertain the validity and reliability of information, and also 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. 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 recently auditing has begun to include other information about the system, such as information about environmental performance. As a result there are now professions that conduct environmental audits.In financial accounting, an audit is an independent assessment of the fairness by which a company's financial statements are presented by its management. It is performed by competent, independent and objective person or persons, known as auditors or accountants, who then issue an auditor's report on the results of the audit.

Such systems must adhere to generally accepted standards set by governing bodies that regulate businesses. It simply provides assurance for third parties or external users that such statements present 'fairly' a company's financial condition and results of operations.Quality audits are performed to verify the effectiveness of a quality management system. This is part of certifications such as ISO 9001. They are essential to verify existence of objective evidence of processes, to assess how successfully processes have been implemented, for judging the effectiveness of achieving any defined target levels, provide evidence concerning reduction and elimination of problem areas, and are a hands-on management tool for achieving continual improvement in an organisation.

For the benefit of the organization, quality auditing should not only report non-conformances and corrective actions, but also highlight areas of good practice. In this way other departments may share information and amend their working practices as a result, also enhancing continual improvement.n the US, audits of publicly-listed companies are governed by rules laid down by the Public Company Accounting Oversight Board (PCAOB). Such an audit is called an Integrated Audit, and auditors have the additional responsibilities of expressing opinions on management's assessment of the firm's internal control, and on the effectiveness of internal control over financial reporting based on their (the auditors') own assessment.

While the four major audit firms listed above provide audit services to the largest corporations in America, audit firms around the world are also in partnership with the Big Four. Since corporations held offices in other parts of the world, they tend to be audited by affiliates of the Big Four to maintain consistency and uniformity in their application of auditing standards.