The inequality that affects people in FEALAC member countries manifests itself in different yet inter-related ways. For example, women, those living in poverty, indigenous people, rural residents and others may experience multiple, simultaneous and compounding forms of exclusion and discrimination that prevent them from fully enjoying their rights and reaching their full potential. A critical first step to overcome these inequalities is to identify population sub-groups that have limited access to opportunities and achieve worse outcomes in various domains, including access to education, health, nutrition and basic infrastructure. Knowing who is being left behind can inform policy and guide the adoption of tailored response strategies. The purpose of this guide is to explain in a user-friendly and practical format how to interpret the results of Classification and Regression Tree Analysis (CART) to identify inequalities in two SDG-related indicators and how these results can be used to inform policy.