The global push for transparency and accountability in supply chains has taken a significant step forward with the publication of two Draft International Standards (DIS) within the chain of custody framework:
- ISO/DIS 13662 – Chain of custody – Mass balance – Requirements and guidelines
- ISO/DIS 13659 – Chain of custody – Book and claim – Requirements and guidelines
These standards aim to harmonize organizations’ methods to track materials and sustainability claims throughout supply chains.
Why these standards matter
Chain of custody (CoC) plays a crucial role in verifying the origin and movement of materials, particularly in industries concerned with sustainability, responsible sourcing, and regulatory compliance. The two draft standards introduce structured approaches to different CoC models:
Mass Balance (ISO/DIS 13662): This method allows for a proportional allocation of certified and non-certified materials within the supply chain. It enables industries—such as chemicals, forestry, and textiles—to make credible sustainability claims even when physical segregation is impractical.
Book and Claim (ISO/DIS 13659): A more flexible approach, book and claim systems decouple sustainability attributes from the physical flow of materials. This model is widely used in renewable energy and carbon markets, where certificates or credits represent responsible production, irrespective of the supply chain.
Impact on industry and compliance
Introducing these standards will provide businesses with globally recognized frameworks for implementing chain of custody systems, helping them align with regulatory requirements, industry best practices, and market expectations. They will also support organizations in making verifiable claims about their environmental and social impact.
As these draft standards progress through the ISO development process, stakeholders across industries should engage in the public consultation phase to ensure the final versions meet practical and sector-specific needs.
For organizations navigating the complexities of sustainability and supply chain transparency, ISO/DIS 13662 and ISO/DIS 13659 represent essential tools for building trust and accountability in global trade.