Sustainability reports, internal control systems, KPIs, contract compliance or crypto asset reserves can be the subject of an assurance engagement. Assurance can be provided at a reasonable or limited level.
In Turkey, assurance engagements are carried out under the POA's Standards on Assurance Engagements (GDS).
Source: GDS 3000
Related terms
Reasonable assuranceA high but not absolute level of assurance; the level of assurance the auditor provides on the financial statements in an independent audit.Limited assuranceA level of assurance based on narrower procedures than reasonable assurance and expressed in negative terms.Sustainability assuranceAn independent practitioner providing assurance on whether the information in a sustainability report has been prepared in accordance with the relevant reporting standards.Reserve auditAn independent auditor verifying that a crypto asset service provider genuinely and fully holds the assets belonging to its clients.Adverse opinionThe opinion in which the auditor states that the financial statements are not presented fairly, where misstatements are both material and pervasive.Agreed-upon proceduresAn engagement in which the practitioner performs procedures agreed with the entity and, where relevant, a third party, and reports only the findings without providing assurance.
Last updated: October 22, 2026 · This definition is for general information only.