They fix the declared unit, the system boundary, the stages included and how data are treated. Thanks to them, two declarations in the same category can be compared on consistent criteria.
Glossary
Product category rules (PCR)
Product category rules (PCR) are the specific set of requirements for developing environmental declarations for a category of products.
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Environmental product declaration (EPD)
An environmental product declaration (EPD) is a verified Type III document, under ISO 14025, that reports the environmental performance of a product based on an LCA and on product category rules.
PCF versus EPD
Difference between a product carbon footprint (PCF, ISO 14067) and an environmental product declaration (EPD, ISO 14025): what each measures, when to use it.
Life cycle assessment (LCA)
Life cycle assessment (LCA) is the standardised method to compile and evaluate the inputs, outputs and potential environmental impacts of a product across its whole life cycle.
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