This document provides a step-by-step guide for reviewing and revising an M&E system for a value chain project. The four main steps are: 1) implement the M&E system, 2) monitor system implementation, 3) conduct formal review workshops, and 4) adjust the M&E system. Key aspects that are monitored include data feedback loops, management and quality. The goal of reviews is to allow for flexibility and willingness to adapt the system. Common pitfalls to avoid are implementing baselines too early, not monitoring the M&E system itself, and not updating the system and indicators over time.