Product Category Rules (PCR) define the rules and requirements for EPDs of a certain product category. PCRs define the methods for the collection of data, the calculation of environmental impact, and how the information should be presented. PCRs enable transparency and comparability between EPDs.
Generic PCRs are a key part of the ISO 14025 standard, whereas the EN 15804 standard provides a core PCR for the Europe-wide generation of construction sector EPD and can be used as such or with additional PCRs. Usually, all EPD publishing platforms such as IBU or EPD Norge have either one PCR as a set of additional rules for published EPDs, or a set of PCRs for different construction product categories.