This document provides requirements and guidelines for the application of the mass balance chain of custody model, as defined in ISO 22095, to any material or product flow within mass balance systems, including how to attribute specified characteristics to flows of such processes.

This document provides requirements and guidelines for the following matters, amongst others:

• differentiations from controlled blending and book and claim models;
• general requirements for organizations active in a mass balance chain of custody model;
• system boundaries including geography and time;
• conversion factors;
• the rolling average percentage method;
•  the credit method;
•  transparency, communication and claims.