The EPS system was developed in its first version in the 1990ies for identifying environmental priority strategies in product design and in other situations where there is a need to choose between two or more design alternatives. Later it has been used for other purposes like investments and Environmental, Social and Corporate Governance (ESG). This report describes the 2020 default version, called EPS 2020d, and particularly its weighting factors. It replaces the 2015d and 2015dx versions.