This diversity practice book teaches readers how to work with a broad range of diverse populations, using the "Person-In-Environment" (PIE) theoretical framework. The diverse populations presented in the book are described within an ecological, strengths perspective. The authors' 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 "Person-In-Environment" 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. For anyone working in a diverse population or looking to gain knowledge in this area.