TS ISO 22095-3

TS ISO 22095-3 is the part of the chain of custody series that addresses the book and claim model, focusing on how a specified characteristic can be attributed separately from the physical flow of materials, products, or processes. In practical terms, it treats the movement of the physical item and the associated claim as related but distinct matters, which is essential when organisations need a clearer structure for traceability, market-based attribution, and communication.

What book and claim means in technical practice

In general technical usage, book and claim is a chain of custody model where a defined attribute is recorded and later claimed without remaining physically attached to the product flow. That attribute may relate to a particular production feature, certified input, or other specified characteristic. As a result, concepts such as system boundaries, geography, time, attribution units, and conversion factors become central to how the model is applied. The scope of TS ISO 22095-3 states that it provides requirements and guidelines for applying this model.

Topics highlighted by the scope

• General requirements for the book and claim chain of custody model
• Differences from mass balance
• System boundaries including geography and time
• Attribution of material flows in and out
• Conversion factors, transparency, communication, and claims

This part is especially relevant where organisations need to manage the relationship between a physical supply chain and a separately claimed attribute in a disciplined way. Its value lies in helping users distinguish among chain of custody models, keep records aligned with the intended scope of the claim, and communicate that claim consistently. TS ISO 22095-3 therefore sits at the intersection of recordkeeping, attribution logic, and the wording of claims used in trade or reporting.