This guide is the first of four supplements to the main guidance document in the UNITAR “Guidance Series for Implementing a National PRTR Design Project”. This document provides specific guidance on implementing Stage 2 of the suggested PRTR design process which is the preparation of a National PRTR Infrastructure Assessment Report. This comprehensive report provides the existing legal, institutional, administrative and technical infrastructure and available national expertise relevant to the design and implementation of a national PRTR system, and thus is a key input for the PRTR design project.