Using the #x1C;Person-In-Environment#x1D; (PIE) theoretical framework, this diversity practice text teaches students how to think about their personal reactions and assumptions about diversity and what constitutes cultural competent #x1C;assessment#x1D; and #x1C;intervention#x1D; when working with a broad range of diverse populations. #xA0; The diverse populations presented in the text are described within an ecological, strengths perspective. The authors#x19; thesis is that, in order to work effectively with diverse populations, it is necessary to take into consideration the complex dynamics of social functioning and social oppression. The #x1C;Person-In-Environment#x1D; theoretical framework provides a basis for analysis of the social, economic, and political reality of these diverse populations. The text presents an affirmative practice approach and builds on the available diversity practice literature. #xA0; This text can be used in diversity practice courses, courses on working with oppressed populations, and other practice courses (such as advanced practice) that focus on diversity issues.