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The concept of materiality is becoming increasingly important for sustainability performance measurement and reporting. It is widely agreed upon that materiality matters, in the sense that companies should identify, prioritize and disclose information on sustainability issues that are considered material. There is, however, a tension at the heart of this consensus, owing to parallel approaches to materiality being used in practice. This paper aims to shed light on how and why the parallel uses of the materiality concept may cause confusion and how this tension could be resolved.

This paper takes as point of departure the tension between two approaches to materiality: based on the Global Reporting Initiative definition, which emphasizes sustainability issues that are important to stakeholders and that have significant impacts and based on the Sustainability Accounting Standards Board definition, which emphasizes sustainability issues that are financially material, i.e. likely to influence the financial performance of the company. This paper discusses the nature and consequences of the tensions between how the two definitions of materiality in sustainability reporting are used in practice, with a particular emphasis on users of information in financial markets. This paper provides empirical insight on these users’ perspectives through a survey (n = 30) and qualitative interviews (n = 6) of financial market professionals.

This study reveals tensions between different approaches to materiality in practice and how this may lead users of sustainability reports to draw unjustified conclusions on the basis of materiality assessments. Specifically, this paper demonstrates the perceived shortcomings in information availability and information quality from the perspectives of different stakeholders in financial markets with different information needs.

The users of sustainability reporting information require clarity in the communication of materiality in non-financial reports. This paper addresses how such clarity can be pursued.

Clarity about materiality in non-financial reporting is important both for investors that pursue financial return on green investments and for society at large, which relies on information about real sustainability impacts.

This paper furthers the understanding of how different materiality concepts may be problematic and how recent and ongoing developments may mitigate the risks of conflating uses of the concept.

This paper aims to investigate the current state of knowledge in key reporting aspects in relation to sustainability reporting in general and to reflect on their relevance to Global Reporting Initiative (GRI) in particular. In doing so, the major gaps in that knowledge are identified, and the paper proceeds to suggest further research avenues.

The authors conduct a review of papers published in leading journals concerning sustainability reporting to analyse the progress in the literature regarding three important reporting topics: materiality, comparability and assurance.

The review conducted in this study shows that there is still work to be done to ensure high-quality and consistent sustainability reporting. Key takeaways from the review of the extant literature are as follows: there is ongoing debate about the nature of sustainability reporting materiality, and single versus double materiality. Clearer guidance and better contextualisation are seen as essential for comparability, and, as GRI suggests, there is an important link to materiality that needs to be considered. Finally, assurance has not been mandatory under the GRI, but the current development at EU level might lead to the GRI principles being incorporated in the primary assurance standards.

In this paper, the authors review and synthesise the previous literature on GRI reporting dealing with three key reporting aspects.

The authors extract some takeaways from the literature on materiality, comparability and assurance that will all be key challenges for GRI in the future.

This paper provides an updated review of the literature on GRI reporting dealing with three key reporting aspects.