Māori are New Zealand’s indigenous peoples colonised by Pākehā (the Māori name given to the descendants of early British settlers), who arrived from the late eighteenth century. Just over 115 years later, the Māori population is diverse and dynamic. In this chapter, we (Houkamau a self-identified Māori, and Sibley a Pākehā) describe the development of our multidimensional model of Māori identity and cultural engagement (MMM-ICE) and present our work as a case study of how qualitative and quantitative methods may be integrated to expand understandings of Māori diversity. We detail our model and measure of Māori identity, its origin and epistemology, and how we developed the scale using mixed methods, both qualitative and quantitative. We offer our work as an example of how bi-cultural collaborators may bridge the gap between Māori views of identity and the psychological imperative for systematic data collection and analysis.