With increasing ethnic and racial diversity in the classroom, understanding classroom dynamics and the use of space has become increasingly important. In particular, when theoretical perspectives, such as that offered by intergroup contact research, promotes the importance of contact between competing groups to improve relations. Adopting a behavioural approach, the research presented here observed intergroup behaviour between Protestants and Catholics, through seating choice, in three integrated secondary schools in Northern Ireland. In addition, it considered the use of classroom seating plans by teachers. The sample involved students from Year 8 (aged 11-12) and Year 10 (aged 13-14), and their teachers. For observations of seating behaviour, data collection took place at three time points in the school year (September, January and June). Teachers were asked to complete a questionnaire regarding their use of seating plans during the January data collection phase. Seating choice was analysed using a statistical index of segregation. Results found persistent religious segregation over time, despite intergroup contact potential. In addition, the use of teacher enforced seating plans was examined and evaluated, suggesting that they may be restricting natural opportunities for intergroup friendship formation. Findings are discussed in relation to implications for theoretical understandings of contact theory, research methods and policy.Everywhere on this earth we find a condition of separateness among groups. People mate with their own kind. They eat, play, reside in homogenous clusters. They visit with their own kind, and prefer to worship together. Much of this automatic cohesion is due to no more than convenience. There is no need to turn to out-groups for companionship. With plenty of people at hand to choose from, why create for ourselves the trouble of adjusting to new languages, new food, or to people of a different educational level? It requires less effort to deal with people who have similar presuppositions. (Allport, 1954, p.17) Separation between groups, whether it is based on race, gender, ethnicity or religion, is evident all around us. It can be observed in the everyday spaces we inhabit, in cafes, at the beach, on the train, in classrooms and in universities. While this is not a novel observation, it is something that the education system (and designers of other shared space) needs to consider. After all, as our classrooms and lecture theatres becomes increasingly ethnically, racially and religiously diverse, we should be considering how these shared spaces are occupied and the impact that this can have on relations within and outside the school setting.