This is the second guidance note in a four-part series of notes related to impact evaluation developed by InterAction with financial support from the Rockefeller Foundation.This second guidance note, Linking Monitoring and Evaluation to Impact Evaluation, illustrates the relationship between routine M&E and impact evaluation – in particular, how both monitoring and evaluation activities can support meaningful and valid impact evaluation. The guidance note is also available in French, Arabic and Spanish on https://www.interaction.org/impact-evaluation-notes.