ISEAL has released a revised version of two key guidance documents to help companies and sustainability systems navigate today’s complex claims and supply chain traceability landscape. 

The Sustainability Claims Good Practice Guide v2 and Chain of Custody (CoC) Models and Definitions Guidance v2 reflect the latest regulatory, technological and market developments, offering clear principles and practical tools for companies, standard-setters and stakeholders worldwide. 

Credible sustainability claims in an era of scrutiny 

With growing concern around greenwashing, and a rise in ‘greenhushing’, credible sustainability claims are more important than ever.  

The updated Claims Guide reinforces principles such as clarity, transparency and accuracy, helping organisations to design effective claims management processes and create trustworthy claims that build confidence and incentivise investment in sustainable practices. 

Strengthening chain of custody models for evolving supply chain needs 

Supply chain dynamics are rapidly evolving, and so must the definitions and models we depend on.   

New regulations such as the EU Deforestation Regulation, technological developments like blockchain, and increased corporate focus on supply chain emissions are transforming how we track and trust supply chain data. 

The revised CoC Models and Definitions Guidance introduces two new models – controlled blending and controlled mass balance – and explains key concepts such as volume reconciliation and attribution, enabling more precise and tailored approaches. It also includes diagrams and infographics to support understanding and implementation. 

Explore the new guidance! 

Both guidance documents are now available on the ISEAL website: 

• Sustainability Claims Good Practice Guide v2
• Chain of Custody Models and Definitions Guidance v2 

Together, these resources provide a stronger foundation for credible claims and transparent supply chains in a rapidly changing world.