The Global Reporting Initiative (GRI), an independent organisation based in Amsterdam, has published the first standards for sustainability reporting since 1997. These standards have undergone several generations (G1 in 2000, G2 in 2002, G3 in 2006, G4 in 2013, GRI Standards in 2016), each broadening and refining the requirements.

The major 2021 revision consolidated the current architecture, widely used to date, and laid the groundwork for thematic evolutions that continue through targeted revisions. This revision notably reaffirmed the centrality of impact materiality as the guiding principle, in a rapidly evolving ESG reporting landscape.

The GRI Standards are used by tens of thousands of organisations worldwide. They are explicitly referenced by numerous regulators, institutional investors and ESG rating agencies. In Europe, the European Sustainability Reporting Standards (ESRS) adopted in 2023 draw heavily on GRI logic, facilitating articulation for organisations already engaged.

This article presents the architecture of the GRI Standards 2021, the materiality assessment method, the universal and topic standards, articulation with other frameworks, and practical recommendations for producing a report that delivers value.

The Architecture of the GRI Standards 2021

The 2021 version structures the standards into three categories.

The universal standards (GRI 1, 2, 3) apply to all organisations, regardless of their sector.

GRI 1: Foundation 2021 presents the fundamentals, reporting principles and key concepts. It is the mandatory entry point into the framework.

GRI 2: General Disclosures 2021 covers the general information that any organisation publishes: profile (activities, location, employees, value chain), governance (management structure, independence, remuneration), strategy (directions, objectives, commitments), stakeholder relations, reporting practices.

GRI 3: Material Topics 2021 formalises the materiality assessment process and how to present the material topics identified. This standard is the methodological core of the approach.

The sector standards (Sector Standards) are published progressively by GRI for specific sectors. As of the date of this article, standards are published for oil and gas (GRI 11), coal (GRI 12), agriculture, aquaculture and fishing (GRI 13). Other sectors are in preparation (metals and mining, financial services, electricity, textiles).

For sectors without a published sector standard, the organisation relies solely on the universal and topic standards.

The topic standards (Topic Standards) cover specific subjects, divided into three series. The GRI 200 series (economic, 6 standards) notably cover economic performance, corruption, competition, taxation. The GRI 300 series (environmental, 8 standards) cover materials, energy, water, biodiversity, emissions, waste, environmental compliance. The GRI 400 series (social, 19 standards) cover employment, labour relations, health and safety, training, diversity, non-discrimination, human rights, local communities, supply chain.

Impact Materiality, Guiding Principle

Impact materiality is the logic that structures the entire GRI approach. It distinguishes the GRI framework from other frameworks that favour solely financial materiality.

The definition of impact materiality adopted by GRI 2021 is as follows: a topic is material if it represents the organisation's most significant impacts on the economy, environment and people, including impacts on human rights.

This definition goes beyond the organisation's own interests. A topic can be material under GRI even if it does not directly affect the organisation's financial performance, provided it corresponds to a significant impact on the environment or society.

The materiality identification process, formalised by GRI 3, takes place in four stages.

Understand the context. The organisation analyses its environment: activities, business relationships, sustainability context, stakeholders.

Identify impacts. It lists potential and actual impacts, positive and negative, on the economy, environment and people, linked to its activities and value chain.

Assess significance. It assesses each impact according to its severity (scale, scope, irremediable character) and, for potential impacts, its likelihood.

Prioritise. It selects the most significant impacts, which constitute the material topics on which the organisation will report.

This methodology requires structured dialogue with stakeholders and documented analysis. It is regularly audited by third parties who verify the reporting.

Topic Standards Applicable to an Infrastructure Operator

For an infrastructure operator, several GRI topic standards are typically activated according to the results of the materiality assessment.

Among the environmental standards, the most frequently material are GRI 302 (energy), GRI 303 (water and effluents), GRI 304 (biodiversity), GRI 305 (emissions), GRI 306 (waste). Each requires both information on the management approach and quantitative indicators.

Among the social standards, frequently material are GRI 401 (employment), GRI 403 (occupational health and safety, revised in 2018), GRI 404 (training), GRI 405 (diversity and equal opportunity), GRI 413 (local communities), GRI 414 (supplier social assessment).

Among the economic standards, GRI 201 (economic performance), GRI 203 (indirect economic impacts), GRI 205 (anti-corruption).

For each activated standard, the organisation must produce the requested information, ideally over several years to allow trend analysis. A GRI report without historical series loses a significant part of its analytical utility.

The Two Levels of Compliance

GRI 2021 offers two levels of compliance declaration.

"Reporting in accordance with the GRI Standards" is the most demanding level. It assumes that the organisation has conducted a materiality assessment compliant with GRI 3, that it reports on all identified material topics, that it provides all information required by the activated standards (except justified exceptions). This declaration is verifiable by a third party and commits the organisation's reputation.

"Reporting with reference to the GRI Standards" is a more flexible level. The organisation can use certain standards without claiming full compliance. This option is useful for organisations starting their approach or who do not wish to assume the full requirement.

Investors and sophisticated stakeholders closely examine the declared compliance level. A properly justified "in accordance" declaration is more credible than a partial reference.

Articulation with Other Frameworks

The sustainability reporting landscape has become denser and the GRI Standards articulate with other frameworks.

The TCFD (Task Force on Climate-related Financial Disclosures) is a framework specialised in climate reporting, structured around four pillars (governance, strategy, risk management, metrics and targets). The GRI Standards, notably GRI 305 Emissions and the governance information in GRI 2, cover part of the TCFD expectations, but dedicated TCFD reporting is often produced in parallel for organisations with high climate exposure.

The ESRS (European Sustainability Reporting Standards) adopted by the European Commission in 2023 structure mandatory reporting under the CSRD (Corporate Sustainability Reporting Directive). The ESRS draw heavily on GRI logic (notably double materiality) and offer facilitative correspondence for organisations already engaged with GRI.

The SASB (Sustainability Accounting Standards Board) standards, now integrated into the IFRS Foundation under the name IFRS Sustainability Disclosure Standards, propose investor-oriented reporting, organised by sector. Their logic favours financial materiality, complementary rather than substitutive to GRI impact materiality.

The TNFD (Taskforce on Nature-related Financial Disclosures) framework is the nature-focused counterpart of TCFD, finalised in 2023. Its adoption is progressing among financial institutions and companies with high exposure to nature-related issues.

For an organisation building its reporting strategy, the combination of GRI plus TCFD plus ESRS (if applicable) today constitutes the most common foundation. SASB can be added for more specific dialogue with investors.

Common Errors in First GRI Reports

Five errors recur among organisations publishing their first GRI report.

Poorly worked materiality. The materiality assessment is sometimes reduced to a questionnaire sent to a few internal stakeholders, without external analysis. The result is a superficial matrix that does not reflect the organisation's actual impacts.

Thematic over-coverage. Some reports attempt to cover almost all GRI topic standards, without prioritisation. The document becomes encyclopaedic and barely usable. Materiality is precisely the tool that allows focus on what matters.

Indicators without depth. Reporting raw figures, without calculation methodology, without precise scope, without historical comparison, impoverishes the information provided. Each indicator must be rigorously documented.

Declarations without commitments. The report presents the company's "sustainable strategy" without measurable objectives, without timeline, without monitoring indicators. The reader cannot assess the seriousness of the commitment.

Isolated report production. When the GRI report is produced by a CSR team detached from operations, without articulation with internal management systems, it ends up presenting an image distinct from that circulating within the company itself. This dissociation undermines credibility.

Third-Party Verification

Several organisations choose to have their GRI report verified by an independent third party. This verification can take two levels.

Limited assurance is the most common level. The verifier concludes that nothing has come to their attention that causes them to believe that the material information in the report is not presented in accordance with the applicable criteria. This level mobilises sample-based controls on data and processes.

Reasonable assurance is more demanding. The verifier concludes that the material information is presented in accordance with the applicable criteria. This level mobilises more intensive controls, comparable to a standard financial audit.

The assurance level chosen depends on the organisation's maturity and stakeholder expectations. For listed issuers and organisations subject to European CSRD, limited assurance on sustainability reporting is progressively becoming mandatory.

What users of GRI reports look for.

  • The rigour of the materiality assessment and consistency of the reporting scope with actual impacts.
  • The depth of indicators: methodology, scope, historical comparison, contextualisation.
  • Transparency on difficulties: non-compliances, deviations from targets, corrective actions, data limitations.
  • Consistency between strategic discourse and operational data.
  • Articulation with other frameworks mobilised (TCFD, ESRS, SASB depending on context).
  • Verification by an independent third party, its level and scope.

Ongoing Developments

The GRI Standards continue to evolve through targeted revisions.

The revision of GRI 403 (occupational health and safety) in 2018 had already modernised this standard. Other themes are the subject of regular work, notably on climate, biodiversity, human rights, in connection with evolutions in other frameworks.

GRI has also formalised its collaboration with the ISSB (International Sustainability Standards Board) to improve consistency between impact materiality reporting (GRI logic) and financial materiality reporting (ISSB logic). This articulation, still under construction, should clarify the international sustainability reporting landscape.

The GRI Standards offer a robust and widely recognised framework for structuring credible sustainability reporting. Their serious adoption requires time, resources, and articulation with the organisation's operational management systems.

For an organisation building its approach, return on investment is measured across several dimensions. Internal improvement through mirror effect: producing the report reveals gaps that guide actions. External credibility: a rigorous GRI report is a signal that investors and partners read. Regulatory anticipation: CSRD obligations and their international equivalents draw heavily on GRI logic.

The GRI Standards are not an end in themselves. They are a tool which, well used, facilitates the construction of an authentic and documented sustainability approach. Misused, they produce a formal report that few people read and which changes nothing in the organisation's practice.

grireporting-durabilitematerialiteesrscsrdsasb