What Is Accreditation?

Accreditation is a formal process through which an authoritative body evaluates and recognizes that an organization, laboratory, or institution is competent to perform specific technical activities according to defined standards. It provides independent confirmation that an entity has the facilities, qualified personnel, documented procedures, and quality management systems necessary to deliver reliable, reproducible results. Accreditation operates one level above certification: where certification confirms that a product, system, or person meets a specified standard, accreditation confirms that the body performing the certification is itself competent to do so.

The discipline draws from metrology, quality management, and conformity assessment theory. The modern international accreditation infrastructure developed through the latter half of the twentieth century as global trade created demand for mutual recognition of test results across national borders, reducing the need for duplicative testing at each border crossing.

Accreditation and Certification

The distinction between accreditation and certification carries practical weight in technical work. An organization seeking to demonstrate compliance with a management system standard such as ISO 9001 pursues certification, which is issued by a certification body. That certification body, in turn, pursues accreditation from a national accreditation body to demonstrate that its auditors, processes, and decision-making meet the requirements of ISO/IEC 17021, the international standard for management system certification bodies. This layered structure creates a chain of trust: regulators and purchasing organizations can verify not just that a supplier holds a certificate, but that the certificate was issued by an accredited body operating under international peer review. Accreditation bodies themselves are subject to peer evaluation under ISO/IEC 17011, the standard governing bodies that accredit conformity assessment organizations.

Conformance Testing and Laboratory Accreditation

For testing and calibration laboratories, accreditation against ISO/IEC 17025 is the primary international framework. It specifies requirements for the technical competence of personnel, the calibration status of measurement equipment, the validation of test methods, and the uncertainty quantification of reported results. The International Laboratory Accreditation Cooperation (ILAC), which merged with the International Accreditation Forum (IAF) in January 2026 to form the Global Accreditation Cooperation, maintains a Mutual Recognition Arrangement (MRA) among national accreditation bodies spanning 135 economies. Under this arrangement, test reports from an ISO/IEC 17025-accredited laboratory in one signatory economy are accepted by regulators and procurement bodies in all other signatory economies, eliminating redundant testing. Conformance testing for technology standards, such as interoperability testing for IEEE 802 network protocols or safety testing for IEC-governed electrical equipment, typically requires the testing laboratory to hold accreditation specific to the methods in question.

Accreditation Bodies and Governance

National accreditation bodies operate under government mandate or delegation in most economies. Examples include UKAS (United Kingdom), A2LA and ANAB (United States), DAkkS (Germany), and CNAS (China). These bodies conduct on-site assessments of organizations seeking accreditation, evaluating documented management systems, technical records, proficiency testing participation, and the qualifications of technical staff. In education, accreditation bodies evaluate academic programs, with engineering programs in the United States evaluated by ABET, which accredits programs against outcomes criteria covering design competency, professional ethics, and technical knowledge. Training requirements flow naturally from accreditation: both technical and educational accreditation frameworks specify that personnel performing assessed activities must demonstrate documented competency maintained through continuing education and periodic re-evaluation.

Applications

Accreditation has applications in a wide range of disciplines, including:

• Testing and calibration laboratories in manufacturing and environmental monitoring
• Certification bodies for quality and environmental management systems
• Engineering education programs evaluated against professional outcomes criteria
• Medical and clinical laboratories under CLIA and ISO 15189
• Cybersecurity and product conformance testing under national regulatory schemes