The purpose of GRI is to create best practice sustainability reports (either standalone or integrated), with an emphasis on flexibility and standardization. This makes it a great tool to:

Understand what you should be reporting on, based on what is material to your organization.
See how you are doing on your sustainability reporting compared to peers.
Adapt your reporting to your company's size/sector.
Develop your reporting over time.
The Global Reporting Initiative (GRI) has been around since the 1990s, which means that they have had a long time to craft a solid methodology. Now, we are even seeing the EU basing a lot of their upcoming mandatory reporting on GRI's process. The most prominent example here is the concept of materiality. In GRI, we focus on impact materiality, and a whole process needs to be applied to ensure that this is measured correctly. Due to the similarities in the methodologies, this can feed directly into your CSRD preparation. Handy, right?

YouSustain's team members have vast experience with the GRI framework. In particular, Mia Holmsen used to be a certified trainer with the GRI Academy and has helped many companies in developing their reports from start to finish.