A structure for PCR documents in the international EPD¬system based on the Central Product Classification is proposed. The Central Product Classification (CPC) of the United Nations is a complete product classification covering goods and services The CPC will be used as the basis for a PCR structure to: 1. Provide a structure for industry specific PCR core modules, or rather the PCR core module and up-streams modules as well as down-streams modules within the product group system boundary 2. Open up for differentiated, but defined levels of requirements in the PCR document, i.e. part of the requirements may be applicable on a generic product group level, part of the requirements may be limited to selected individual products. The PCR document should be structured accordingly. Report in Swedish