The inventory method is used in the NF P01-010 standard for open-loop waste recovery processing (from one product to another). The inventory creates a real or fictitious border between the product that generates the waste and the product that uses it. Everything that is upstream of the inventory is therefore part of the life cycle of the product that generates the waste. Everything that is downstream of the inventory is part of the life cycle of the product that uses the waste. The position of the inventory is defined based on technical, legal and economic criteria.
For example, for concrete waste, the inventory can be positioned after the first crushing. The concrete product then takes on the impacts of being transported to a recycling centre and crushed. The steps after crushing, which transform the crushed concrete into a road product for example, belong to the road product’s life cycle.