This document aims to support the adoption and implementation of the U4E Model Regulation Guidelines (Model Regulations) by indicating how market and impact assessments help with selecting appropriate energy efficiency tiers for MEPS and labels (with the Model Regulations as a basis), when to revise these levels, and ways to reference the U4E Product Registration System (PRS) guides to inform such assessments. The Model Regulations and this supplemental guidance are intended to simplify and expedite the policy development process based on what is often practicable in markets where there is limited to no existing experience and protocols for MEPS and labels.