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This International Standard provides the principles and requirements for type III environmental declarations (EPD) of building products. This International Standard contains specifications and requirements for the EPD of building products. Where this International Standard contains more specific requirements, it complements ISO 14025 for the EPD of building products. This International Standard provides a framework for and the basic requirements for product category rules (PCR) as defined in ISO 14025 for type III environmental declarations of building products. Type III environmental declarations for building products, as described in this International Standard, are primarily intended for use in business-to-business communication, but their use in business-to-consumer communication under certain conditions is not precluded. This International Standard does not define requirements for developing type III environmental declaration programmes. Requirements for type III environmental declaration programmes are found in ISO 14025. The working environment is not included in this International Standard because it is normally a subject for national legislation.