Studies of schooling in Northern Ireland have examined the benefits and challenges of schoolbased integration of students from culturally diverse backgrounds--principally Catholic and Protestant. Previous studies have focused mainly on two statutory approaches: Integrated Education and Shared Education. This study compared the dynamics associated with these approaches, and a third, less examined approach, sometimes referred to as 'natural' integration. Also, while much school-based research has focused on Catholic and Protestant relations, the growing number of newcomers from Eastern Europe, Western Asia, and North Africa has received less attention. This study asked, What role, if any, do different ways of managing student diversity-- Catholic, Protestant, and newcomer-- play with respect to school culture and student attitudes toward diversity? Drawing on observations and interviews with 99 participants in four schools representing a range of approaches, the study found the school that most openly acknowledged students' diverse cultural identities and addressed related social justice issues through a schoolwide "meta-curriculum," had the greatest positive impact on student attitudes toward other cultures.