This document refers to the overarching EPB-standard, ISO 52000-1[1]. It contains information to support the correct understanding, use and national implementation of ISO 52000-1. This includes: explanation on the procedures and background information and justification of the choices that have been made; reporting on validation of calculation procedures given in the standard; explanation for the user and for national standards writers involved with implementation of the set of EPB standards, including detailed examples.