This chapter outlines the development, rationale, and trial of the TEEMA Resources, which is a set of teaching materials designed to promote tolerance and ethnocultural empathy among Year 10 and 11 pupils (age 14 to 15) in Welsh secondary schools. Drawing on the researcher’s experience of teaching GCSE Sociology and Psychology to adult learners, and informed by gaps identified in citizenship education provision, the TEEMA Resources integrate key sociological and social psychological concepts, such as in-group/out-group dynamics, conformity, obedience, labelling theory, and media influence, alongside classic studies by Tajfel, Sherif, Milgram, Asch, Elliott, and others. The resources comprise three Power-Point based lessons with accompanying pupil workbooks and video materials, deliberately avoiding a focus on specific minority groups to reduce defensiveness and enhance transferability across contexts. A case study methodology was employed in two demographically contrasting Welsh secondary schools, involving intervention and control groups, teacher interviews, and pupil focus groups. To measure impact, the Adolescent Scale of Ethnocultural Empathy (ASEE) was developed by adapting the Scale of Ethnocultural Empathy by Wang et al. (Journal of Counseling Psychology 50:221, 2003) for a 14–15-year-old age group. This chapter details the design and piloting of the ASEE, the implementation of the classroom intervention, and the data collection process, setting the stage for subsequent analysis of whether embedding elements of Sociology and Psychology into citizenship education can measurably increase pupils’ tolerance and ethnocultural empathy.