In this first of a series of episodes on monitoring, evaluating and evidencing impact, Mark discusses one of the biggest mistakes that people make when the evaluate their engagement instead of their impact, and provides simple tools anyone can use to keep track of their impact with minimal time and effort. He concludes by explaining the difference between monitoring and evaluation and introducing impact evaluation concepts and approaches. The episode draws on this paper about evaluating impact: https://www.sciencedirect.com/science/article/pii/S0048733320302225?via%3Dihub