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Attestation engagement

An attestation engagement is an engagement in which an independent practitioner reports on a subject matter, or on someone else's assertion about it.

SOC 1, SOC 2 and SOC 3 examinations are attestation engagements under AICPA standards, and the ISAE standards play the same role internationally. The output is a report with an opinion, which is why SOC 2 is described as a report rather than a certificate.

Compare ISO 27001, which certifies a management system.

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Related terms

SOC 2
SOC 2 is an attestation report in which a CPA firm gives an opinion on a service organization's controls against the AICPA Trust Services Criteria.
ISAE 3000
ISAE 3000 is the IAASB's international standard for assurance engagements on subject matter other than historical financial information.
Qualified opinion
A qualified opinion is an auditor's opinion that the controls met the criteria except for specific matters described in the report.

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