| Scheme owner | AICPA, United States | Cyber Security Agency of Singapore |
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| Who assesses | A licensed, independent CPA | Certification bodies appointed by CSA |
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| What you get | An attestation report containing the auditor's opinion | A certificate and mark at one of five tiers |
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| Structure | Trust Services Criteria: Security, plus optional Availability, Processing Integrity, Confidentiality, Privacy | Tiers from Supporter (10 domains) to Advocate (22 domains) |
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| Time frame | Type 1 on a date; Type 2 across an observation period | Valid three years, with a surveillance audit every year |
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| Recent change | 2017 criteria with 2022 points of focus in use; a 2027 revision was proposed in October 2026 | 2025 edition added cloud, AI and OT security; the 2022 edition was retired in February 2026 |