This paper uses ethnographic action research to explore how the objectives of the Australian Curriculum Intercultural Understanding can be achieved in a culturally diverse Year 5/6 (ages 10-12) primary school class in Melbourne. It examines whether a history unit on migration, that uses a structured historical inquiry approach, encourages culturally diverse students to develop a more critical and reflexive understanding of multiculturalism. Using Banks' multicultural framework and Bath's approach to ethnographic action research, I argue that the oral history component of a Year 5/6 history unit supported students to develop their Intercultural Understanding. I suggest that ethnographic action research is an effective approach for investigating the implementation of new teaching initiatives.