Materiality assessment

“Materiality is a conclusion; the assessment is the evidence trail that must support it. ”

A materiality matrix can be drawn in an afternoon. A materiality assessment cannot. The familiar chart - topics plotted by importance to stakeholders and importance to the business - has often become the visible product of a process that is much more demanding than ranking labels on two axes. A materiality assessment determines which sustainability matters cross a threshold for action or disclosure.

The threshold depends on the framework being applied. Under GRI, the focus is the organisation's most significant impacts on the economy, environment and people, including human rights. Under the European Sustainability Reporting Standards, the assessment covers impact materiality and financial materiality. In other settings, materiality may concern information capable of influencing investor decisions.

The first discipline is to define the purpose.

An assessment used to select report topics is not automatically sufficient for due diligence, enterprise risk management or strategy. A reporting process may identify broad themes; operational decisions need specific impacts, locations, affected groups, causes and controls. Reusing one assessment for every purpose can create the appearance of integration while losing the detail needed for action.

EFRAG's 2024 implementation guidance describes an illustrative process for understanding context, identifying actual and potential impacts, risks and opportunities, assessing them and determining what is material. It emphasises that the ESRS do not prescribe a single method. This flexibility is useful, but it also places responsibility on the undertaking to make its approach, evidence and judgements defensible.

Topic lists are only a starting point.

“Water,” “human rights” or “biodiversity” are too broad to assess without context. Water withdrawal in a water-abundant location differs from extraction in a stressed watershed. Human-rights risk in office procurement differs from recruitment through labour brokers. Biodiversity impact differs between an established plantation and expansion near intact habitat.

Materiality emerges from the relationship between the activity and its context. Stakeholder engagement contributes evidence; it does not replace judgement. Popularity is not severity. A topic can receive few survey votes because affected people were not invited, did not trust the process or lacked the language to describe the impact.

Conversely, a visible issue may attract attention despite relatively limited consequence.

The process should give particular weight to affected stakeholders and legitimate representatives, not treat every respondent as interchangeable.

Scoring can improve consistency but also create false objectivity. Multiplying scale, scope, likelihood and financial exposure produces a number, yet each input contains assumptions. Thresholds can be designed to produce a manageable list rather than reflect the evidence. Averaging may allow a very severe impact to disappear behind a lower likelihood score.

Human-rights due diligence therefore prioritises severity in ways that should not be flattened by generic risk arithmetic. Value-chain coverage is another test. The most significant impacts may sit far from direct operations, where data are weaker and control is limited. Weak visibility does not make a matter immaterial.

The assessment should distinguish absence of evidence from evidence of absence and identify where further investigation is needed. Materiality changes.

Acquisitions, new sourcing regions, regulation, scientific evidence, grievances and climate events can alter the assessment. Annual refreshes should not become automatic reruns of last year's matrix. Governance should define triggers for reassessment and preserve an audit trail showing what changed, why thresholds were applied and who approved the conclusion. The output should be more than a list.

For each material matter, organisations need a clear description of the impact, risk or opportunity; where it occurs; who is affected; time horizon; evidence; uncertainty; threshold decision; and implications for policy, action, targets and disclosure. Without that bridge, materiality becomes a reporting filter detached from management. A credible process also permits challenge.

Business units should be able to question an assessment, but not quietly remove a difficult matter because it is commercially inconvenient. Review should test the evidence, threshold and reasoning, preserve dissent where relevant and record who approved the conclusion. The governance trail matters because materiality judgements influence strategy, controls and disclosure long after the workshop ends.

A credible assessment is not the one with the most stakeholder responses or the most elaborate heat map. It is the one that allows an informed reviewer to follow the reasoning from context and evidence to the final set of matters - including why apparently important issues did or did not cross the threshold.

Practical application

Start with activities, business relationships, geographies and affected groups rather than a generic topic catalogue. Identify actual and potential impacts, risks and opportunities using internal data, grievances, scientific evidence, sector research and engagement with affected stakeholders. Define criteria and thresholds before final scoring.

Document evidence, assumptions, uncertainty, dissent and governance decisions. Link each material matter to responsible owners, policies, actions, targets and disclosures, and establish triggers for reassessment when the business or external context changes.

Why it matters

Materiality determines what receives management attention and what disappears from view. A weak process can exclude severe impacts, concentrate reporting on easy metrics and create disclosure that is comprehensive in appearance but incomplete in substance.

Common misconception

A materiality assessment is often treated as a stakeholder survey that produces a matrix. Surveys can inform the process, but materiality requires evidence-based judgement against defined criteria. Stakeholders do not vote an impact into or out of existence.

Connections

Materiality introduced the threshold concept earlier in the book. Double Materiality distinguishes impact and financial perspectives. Severity and Salience shape prioritisation for human-rights impacts. Stakeholder engagement supplies evidence, while Data Quality and Uncertainty determine how confidently conclusions can be drawn.

A question worth asking

Could an independent reviewer reconstruct why each matter crossed - or failed to cross - the materiality threshold?

Selected references

European Commission. 2023. Commission Delegated Regulation (EU) 2023/2772 establishing the European Sustainability Reporting Standards. EFRAG. 2024. IG 1: Materiality Assessment Implementation Guidance. Global Reporting Initiative. 2021. GRI 3: Material Topics 2021. Beske, F. , Haustein, E. and Lorson, P. C. 2020. Materiality Analysis in Sustainability and Integrated Reports.

Sustainability Accounting, Management and Policy Journal 11(1): 162-186. Accountancy Europe. 2023. Sustainability Reporting: Materiality Assessment.