Verification

“Verification does not make a claim true; it tests whether the evidence supports the claim as stated. ”

Verification is often used as a synonym for checking. In conformity assessment it has a more specific role: confirmation of declared information about events or results that have already occurred. The object is the claim, and the verifier evaluates whether it is truthfully stated against programme criteria.

ISO/IEC 17029:2019 establishes general principles and requirements for bodies performing validation and verification. It distinguishes the two by time. Verification addresses claims about past events or results already obtained. Validation addresses the plausibility of assumptions for intended future use or projected outcomes.

A greenhouse-gas inventory provides a familiar example. An organisation reports emissions for a completed year. Verification examines boundaries, data, calculations, controls, estimates and evidence to determine whether the statement is materially correct under the applicable programme. It does not prove that the organisation is climate responsible or that emissions will fall.

Criteria and scope determine the conclusion. A verifier needs to know the reporting standard, organisational boundary, period, sites, data sources, materiality threshold and intended users. A verified number can still omit categories that were outside the agreed scope. Public communication should not erase those exclusions.

Evidence is seldom complete. Verifiers use sampling, analytical procedures, recalculation, observation, interviews and external confirmation. The nature and extent of work may vary according to risk and the level of assurance defined by the programme. A limited engagement does not provide the same confidence as a more extensive one, and the wording of the conclusion should reflect the difference.

Materiality is not permission to ignore inconvenient issues. It guides whether misstatement could influence intended users. Many small errors can become material together, and a qualitatively important omission may matter even if its numerical value is low. Programmes should define how quantitative and qualitative materiality are applied.

Independence and competence are central. A body that designed the data system or calculated the claim may face a self-review threat when verifying it. Technical competence must match the subject: land-use emissions, human-rights claims and mass-balance accounting require different evidence and expertise.

Verification can also be confused with certification. Verification confirms a particular claim, often for a period or statement. Certification provides an attestation of continuing conformity to specified requirements within a scheme and may include surveillance. A verified report is not automatically a certified management system or product.

The process should address misstatement, not only missing documents. Data can be complete and conceptually wrong. A company may report a supplier's avoided emissions as its own reduction, use an inappropriate baseline or count a retired certificate twice. Verifiers need authority to challenge methods and claim logic, not merely trace numbers to files.

Evidence limitations should be visible. Restricted site access, unavailable primary data, management estimates or uncertainty may affect the conclusion. A clean-looking verification statement can mislead if qualifications and scope are separated from the public claim.

Regulation and green-claims scrutiny are increasing the importance of substantiation. Verification can strengthen evidence, but organisations remain responsible for the claim. Outsourcing the check does not transfer responsibility for misleading language or omitted context.

The discipline is to align the statement, criteria and evidence. Verification asks: what exactly is being claimed, about which completed period or result, under which rules, with what materiality and assurance, and what did the verifier actually conclude? The word verified should never be more prominent than its boundaries.

Practical application

Define the claim, intended user, criteria, boundary, period, materiality and assurance level before engagement. Maintain an evidence trail from source data through calculation to public statement. Resolve double counting, estimates and methodological changes explicitly.

Select a competent and impartial verifier and disclose conflicts. Keep the verification statement with the claim, including limitations and qualifications. Treat findings as system improvements and correct public communications where evidence does not support the original wording.

Why it matters

Organisations increasingly publish complex environmental and social data that users cannot independently reconstruct. Verification can increase confidence that historical claims are materially and truthfully stated, while revealing weaknesses in data systems and controls.

Common misconception

Verification is often treated as proof that a claim is fully true or that the underlying activity is good. It confirms a defined statement against criteria using available evidence. It does not remove uncertainty, expand scope or judge values not included in the programme.

Connections

Validation addresses future-oriented assumptions and projected results. Certification provides continuing third-party attestation within a scheme. Conformity assessment supplies the broader framework, while materiality and claims governance determine what errors and omissions matter to users.

A question worth asking

If a user read only the word verified, which limitation, boundary or assumption in the verification statement would they be most likely to miss?

Selected references

ISO/IEC 17029:2019. Conformity Assessment - General Principles and Requirements for Validation and Verification Bodies. ISO 14064-3:2019. Greenhouse Gases - Part 3: Specification with Guidance for the Verification and Validation of Greenhouse Gas Statements. International Auditing and Assurance Standards Board. 2013.

ISAE 3000 (Revised), Assurance Engagements Other than Audits or Reviews of Historical Financial Information. AccountAbility. 2020. AA1000 Assurance Standard v3. Boiral, O. et al. 2019. Ethical Issues in the Assurance of Sustainability Reports. Journal of Business Ethics 159: 1111-1125.