In a world where every investment matters, advertisers are focused on measuring the impact of their marketing. Many are taking control of that measurement, bringing some or part of that process in-house. There is a growing number of open source solutions supporting these efforts. This episode discusses open source tools for measurement in general and solutions for marketing mix models in particular. Insights, potential pitfalls and guidance on in-housing MMM are shared by Joshua Pearce, Head of Brand Performance, The Hut Group, Karen Flores, Senior Manager Consulting AI&D, Deloitte and Igor Skokan, Marketing Science Director, Meta.