Which GRI document outlines the reporting principles?

The document that outlines the reporting principles within the Global Reporting Initiative framework is GRI 1: Foundation 2021. This document establishes the foundational concepts and context necessary for sustainable reporting, including the principles that underlie the preparation of sustainability reports. These principles ensure the quality and relevance of the reported information, guiding organizations in their sustainability disclosures.

GRI 1 specifically articulates key principles like stakeholder inclusiveness, sustainability context, materiality, and completeness, which are vital for any reporting organization to consider when preparing its sustainability report. By adhering to these principles, organizations can enhance the credibility and utility of their reporting processes.

In contrast, GRI 2: Reporting Guidelines 2021 focuses on additional guidelines for implementing the reporting framework. GRI 3: Sector Standards pertains to sector-specific disclosures rather than overarching principles, and GRI 4: Acceleration Program is aimed at advancing sustainability practices, not specifically on outlining reporting principles. Thus, GRI 1 is the correct answer as it directly addresses the foundational reporting principles necessary for effective sustainability reporting.