The attestation standards establish requirements for performing and reporting on examination, review, and agreed-upon procedures engagements that enable practitioners to report on subject matter ordinarily other than financial statements, for example, an entity’s compliance with laws or regulations, the effectiveness of an entity’s controls over the security of a system, and the fairness of the presentation of a statement of greenhouse gas emissions.
The attestation standards are developed and issued in the form of SSAEs and are codified into sections. The identifier “AT-C” is used to differentiate the sections of the clarified attestation standards (“AT-C" sections) from the sections of the attestation standards that are superseded by SSAE No. 18 (“AT” sections).
In clarifying the attestation standards, the ASB used the following special drafting conventions to make the standards easier to read, understand, and apply:
- Establishing objectives for each AT-C section
- Including a definitions section, when relevant, in each AT-C section
- Separating requirements from application and other explanatory material
- Numbering application and other explanatory material paragraphs using an A- prefix and presenting them in a separate section that follows the requirements section
- Using formatting techniques, such as bulleted lists, to enhance readability