InnerSource has become a powerful model for accelerating collaboration, reducing silos, and improving software delivery. Yet many organizations struggle to answer a simple question: “How do we measure success?” In this talk, Younes Hairej shares lessons learned from leading large-scale cloud-native transformations and working with organizations adopting InnerSource practices. He introduces a practical framework for assessing InnerSource maturity, identifying meaningful metrics, and connecting engineering collaboration to business outcomes. Attendees will learn how to move beyond vanity metrics such as repository counts and pull requests, and instead measure improvements in developer productivity, knowledge sharing, operational efficiency, platform adoption, and organizational agility. Whether you are just starting your InnerSource journey or scaling it across a large enterprise, this session provides practical guidance for making InnerSource visible, measurable, and valuable to business leaders.