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Hammer, M. R., Bennett, M. J., & Wiseman, R. (2003). Measuring intercultural sensitivity: The intercultural development inventory. International Journal of Intercultural Relations, 27(4), 421-443. doi:10.1016/S0147-1767(03)00032-4
"IDI LLC, owned and operated by Mitchell R. Hammer, Ph.D. specializes in the assessment and development of intercultural competence based on the Intercultural Development Inventory® (IDI®). The Intercultural Development Inventory® (IDI®) is a statistically reliable, cross-culturally valid measure of intercultural competence adapted from the Developmental Model of Intercultural Sensitivity."