Accreditation vs. Certification: Key Distinctions
Accreditation and certification are both conformity assessment mechanisms, but they operate at different levels of the credentialing hierarchy and carry distinct legal and operational consequences. Confusing the two terms produces compliance gaps that affect workforce recognition, regulatory standing, and program defensibility. This page maps the definition, mechanism, common scenarios, and decision boundaries for each concept within the US national credentialing landscape.
Definition and scope
Accreditation is a formal, third-party attestation that a body — such as a certification organization, laboratory, or inspection agency — meets a defined set of competency and impartiality requirements. Certification, by contrast, is a third-party attestation that a person or product conforms to specific requirements, typically defined through examination or audit against a published standard.
The International Organization for Standardization and the International Electrotechnical Commission codify this distinction explicitly. ISO/IEC 17011:2017 (ISO) governs accreditation bodies; ISO/IEC 17024:2012 (ISO) governs bodies that certify persons. The two standards exist at different rungs of the same oversight ladder: an accreditation body evaluates whether a certification body is qualified to operate, and only then does the certification body evaluate whether individual candidates qualify for credentials.
In the US, the National Commission for Certifying Agencies (NCCA) and the ANSI National Accreditation Board (ANAB) are the dominant accreditation bodies for personnel certification programs. Both evaluate certification bodies against published standards — NCCA against its own Standards for the Accreditation of Certification Programs and ANAB against ISO/IEC 17024. The scope of accreditation covers governance, examination development, psychometric validity, conflict-of-interest controls, and ongoing oversight processes.
For a broader overview of how credentialing layers connect, see the Compliance Standards Overview.
How it works
The mechanisms for accreditation and certification follow parallel but distinct process architectures.
Accreditation process (certification body → accreditation body):
- Application and self-study — The certification body submits documentation demonstrating conformance to the applicable accreditation standard (e.g., ISO/IEC 17024 or NCCA Standards).
- Document review — Peer reviewers evaluate governance documents, exam development protocols, psychometric data, and policy frameworks.
- On-site or virtual assessment — Reviewers interview staff and commissioners, observe operations, and verify procedural fidelity.
- Commission decision — An independent commission (not the review team) votes on accreditation status: full accreditation, conditional, or denial.
- Surveillance and renewal — Accreditation cycles are typically 5 years, with interim reporting or surveillance reviews. NCCA requires annual reports; ANAB schedules surveillance assessments at defined intervals.
Certification process (candidate → certification body):
- Eligibility determination — The candidate demonstrates prerequisite education, experience, or training, as defined by the certification program eligibility criteria.
- Application and fee — Formal application is submitted and reviewed for completeness.
- Examination or audit — The candidate completes a standardized assessment validated through psychometric methods.
- Decision — A pass/fail or competency determination is issued by the certification body.
- Maintenance — Credential holders complete continuing education or reexamination on a defined cycle. See Recertification and Renewal Compliance for cycle structures.
The separation of decision-makers from evaluators at both levels is a core impartiality control mandated by ISO/IEC 17011 (accreditation) and ISO/IEC 17024 (certification).
Common scenarios
Understanding which mechanism applies depends on the actor seeking recognition and the regulatory or market context.
Scenario 1 — A new professional certification program seeks credibility.
A professional association launches a certification program and applies for NCCA accreditation. The accreditation review covers exam development validity, governance structure, and conflict-of-interest policies. Accreditation signals to employers and regulators that the certification body operates to an independent standard — not that individual holders are automatically qualified for licensure.
Scenario 2 — A state licensing board adopts a certification for regulatory purposes.
A state board of nursing or engineering may require or recognize specific certifications as partial fulfillment of licensure requirements. The distinction matters here: the state licenses the individual (a governmental act); the certification body certifies the individual (a private conformity assessment act). These are parallel tracks. See State Licensure and Certification Compliance for how these tracks intersect.
Scenario 3 — A federal agency mandates accredited certification.
Federal agencies may specify that contractors must hold certifications issued by accredited certification bodies. The Department of Defense, for example, references accredited certification bodies in certain workforce directives. The accreditation requirement filters out unverified credentialing programs before any individual certification is evaluated.
Scenario 4 — An individual holds a certification from a non-accredited body.
If the issuing certification body is not accredited by a recognized accreditation body (NCCA, ANAB, or equivalent), the credential may lack portability across employers or regulatory jurisdictions — even if the underlying examination is technically sound.
Decision boundaries
The following distinctions clarify when each mechanism applies:
| Dimension | Accreditation | Certification |
|---|---|---|
| Subject of assessment | An organization or body | An individual, product, or process |
| Issuing authority | Accreditation body (NCCA, ANAB) | Certification body |
| Governing standard | ISO/IEC 17011, NCCA Standards | ISO/IEC 17024, program-specific standards |
| Output | Accreditation status for the body | Credential for the holder |
| Renewal cycle | Typically 5 years (body level) | Typically 2–5 years (holder level) |
| Regulatory hook | Required by agencies for program recognition | Required by employers or boards for individual recognition |
A certification body that is not itself accredited may still issue technically valid credentials, but those credentials carry less regulatory and market weight. Conversely, accreditation of a certification body does not automatically validate every policy decision that body makes — ongoing oversight and auditing of certification programs remains a continuous obligation.
When a program is designed for a federally regulated sector, Federal Regulatory Alignment requirements add a third layer: the accredited certification must also map to agency-defined competency frameworks, such as those published by the National Institute of Standards and Technology (NIST) or the Occupational Safety and Health Administration (OSHA).
References
- ISO/IEC 17011:2017 — Conformity assessment: Requirements for accreditation bodies accrediting conformity assessment bodies
- ISO/IEC 17024:2012 — Conformity assessment: General requirements for bodies operating certification of persons
- National Commission for Certifying Agencies (NCCA)
- ANSI National Accreditation Board (ANAB)
- Institute for Credentialing Excellence — Standards and Accreditation
- National Institute of Standards and Technology (NIST)
- Occupational Safety and Health Administration (OSHA)