Strengthening assurance through witness assessments
A credible certification system depends not only on strong standards, but also on the quality and consistency of the audits used to assess conformance with them. ASI’s Witness Assessment programme provides an important means of observing how ASI Audits are carried out in practice, supporting auditor competence and identifying opportunities to strengthen the assurance system over time.
27 October 2026
During a Witness Assessment, an ASI staff member joins the audit team on site and observes the ASI Audit as it is carried out by an ASI Accredited Auditing Firm. The ASI staff member does not participate in conducting the audit or assessing the Entity’s conformance. Instead, the purpose is to observe how the audit is conducted in practice, including whether appropriate audit methodologies are being applied and whether audit teams demonstrate the competence needed to carry out impartial and effective ASI Audits.
Witness Assessments have been undertaken for ASI Performance Standard Audits across the aluminium value chain, with particular attention to upstream activities such as bauxite mining. To date, assessments have taken place at ASI Certified Entities in 17 countries: Australia, Brazil, Cameroon, China, Denmark, Germany, Guinea, Hungary, Iceland, India, Indonesia, Jamaica, Malaysia, the Netherlands, Norway, Qatar and the United Kingdom.
| What a Witness Assessment is | What a Witness Assessment is not |
|---|---|
| An ASI staff member joining an ASI Audit on site to observe how the audit is conducted | ASI joining the audit team as an auditor |
| An assessment of the Auditing Firm’s approach, including audit planning, methodology, techniques and auditor competence | A separate assessment of the ASI Member’s conformance with the ASI Standards |
| An opportunity to observe how auditors consider materiality, risk, objective evidence and site-specific circumstances | An opportunity for ASI to direct how the audit should be conducted |
| A way to provide feedback to auditors and Auditing Firms and support ongoing improvement of the assurance system | ASI evaluating audit findings or assigning conformance ratings |
| A source of first-hand insight into how ASI Standards and assurance processes play out in different operational, social and cultural contexts | A replacement for the independent judgement of the ASI Accredited Auditing Firm |
| An input into auditor training, guidance, oversight and the ongoing development of ASI’s assurance system |
The assessment looks at how the audit is planned and conducted, including auditors’ understanding of the Standard and its criteria, their consideration of materiality and risk, auditing techniques, review of objective evidence and attention to site-specific circumstances. This includes consideration of relevant social and cultural contexts, as well as the overall conduct of the audit team.
The value of the process extends beyond the individual audit. Feedback is provided to auditors and their Auditing Firms, while broader observations help inform auditor training and information materials, ASI’s oversight activities and ongoing engagement with ASI Accredited Auditors and Auditing Firms.
Witness Assessments also provide valuable first-hand experience for the ASI staff members taking part. Being on site provides direct insight into the diverse operational, environmental, social and cultural contexts in which the ASI Standards are applied, as well as the practical challenges that can arise when assessing their implementation.
Language and local context are one example. Experience from Witness Assessments has highlighted the challenges audit teams can face when engaging not only with company personnel, but also with affected communities where communication may take place in local languages and dialects. Meaningful community engagement depends on being able to hear and understand those perspectives and to recognise the local context in which issues and impacts arise.
Experience in Guinea helped identify a need for greater local capacity within audit teams, combining language skills and knowledge of the local context with an understanding of the issues that need to be explored during an ASI Audit. In response, ASI encouraged local members of the Indigenous Peoples Advisory Forum (IPAF) to undertake the in-depth training required to become ASI Registered Specialists. The training builds knowledge of the aluminium value chain, the ASI Standards and their criteria, as well as the audit process and the issues and situations specialists may encounter on site. This broader grounding enables Registered Specialists to contribute their expertise, local knowledge and language skills as informed members of audit teams.
This approach is also developing in India, where several IPAF members are now working as Registered Specialists. Some come from the regions and communities affected by the activities being assessed, bringing perspectives and contextual knowledge that can be difficult for an external audit team to acquire.
This is one example of how first-hand observations made through the Witness Assessment programme can translate into broader learning and improvements to ASI’s assurance system. Experience gained by participating ASI staff contributes to a deeper understanding within the Secretariat of how the Standards and assurance processes work in practice across different parts of the aluminium value chain and in very different local contexts.
These insights are also feeding into the current ASI Standards Revision, helping to identify where clearer guidance or improved conformance assessment tools may be needed to support effective and consistent implementation of the revised Standards.
Importantly, a Witness Assessment does not change the respective roles of ASI and the independent Auditing Firm. The Witness Assessor observes the audit process but does not direct the audit, evaluate audit findings, assign conformance ratings or independently determine whether an ASI Member conforms with the ASI Standards. Where a potentially significant omission or other issue is observed, this may be raised with the Audit Team in accordance with the Witness Assessment procedure.
Through this combination of observation, feedback and first-hand experience, Witness Assessments provide ASI with an important mechanism for strengthening the quality, consistency and effectiveness of assurance – while generating practical learning that can contribute to the continued development of ASI’s Standards, guidance and assurance system.
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