This book examines the role of education in fostering tolerance and ethnocultural empathy among secondary school pupils, arguing that these capacities can be explicitly taught through an interdisciplinary approach grounded in sociology, social psychology, and political philosophy. Motivated by the urgent need to address rising intolerance and xenophobia among young people, the work critiques gaps in the UK secondary curricula and the challenges teachers face in tackling anti-racism and diversity issues. Central to the study is the development of the TEEMA Resources (Tolerance and Ethnocultural Empathy for Mutual Acceptance), a teaching toolkit designed to engage Year 10 pupils with concepts such as in-group/out-group dynamics, labelling theory, and media influence. Employing a mixed-methods case study in two contrasting Welsh school contexts, the research adapted the Scale of Ethnocultural Empathy (Wang et al., Journal of Counseling Psychology 50:221, 2003) to create the Adolescent Scale of Ethnocultural Empathy (ASEE) for measuring impact. The findings indicate that targeted sociological and psychological content can enhance pupils’ critical thinking, empathy, and awareness of prejudice, supporting a shift from “thin” to “thick” forms of tolerance, as conceptualised in the Conceptual Framework of Tolerance for Community Cohesion. The book offers practical resources, policy insights, and transferable strategies for educators and youth practitioners internationally, advocating for a developmental approach to citizenship education that progresses from coexistence towards an active celebration of diversity.