A method to match output (i.e. products with recycled content) with input (i.e. quantity of recycled feedstock) within a predefined system boundary (see below) and within a given booking period (usually one year).
This is a product for whose manufacture in the value chain waste-based raw materials were demonstrably used in the mass balance. The proportion of waste-based raw materials in the product does not necessarily have to be physically detectable.