The purpose of this document is to provide guidance that might help IA practitioners to operationalize the Impact Assessment Follow-up International Best Practice Principles published by IAIA (hereafter, simply the Principles Document) by providing additional information regarding their application in practice. The Principles Document (reproduced in Appendix A) defines IA follow-up, outlines objectives for IA follow-up, and explains what it entails with respect to the five key elements of monitoring, evaluation, management, engagement and communication, and governance. It then briefly explains 15 best practice principles. In this Guidance, each of the 15 Principles are included as published—no amendments are made, nor any repetition of that content (beyond simply re-stating each of the principles when they are addressed).