The UNI/PdR 88:2020 is a practice guideline developed by uni pdr 88 the Italian Standardization Body (UNI) in collaboration with various certification and inspection organizations. This guideline establishes the methods for verifying the content of recycled, recovered, and by-product materials in products declared by organizations. It is applicable to a wide range of products, especially those indicated in the decrees related to Minimum Environmental Criteria (CAM) issued by the Italian Ministry of Environment.