Chapter 3 discusses how those needing psychological rehabilitation come from diverse backgrounds, how sensitivity to diversity issues is a critical element addressed in the APA Ethics Code, as well as in the Multicultural Guidelines promulgated by the APA, and how 'disability' has come to be viewed as another type of diversity. It also covers how the RP must be aware of these differences and their impact on the treatment process. Also discussed is how the specialty as a whole has embraced the concept of multicultural competence, and how the individual-environment interaction is an essential aspect of understanding disability, encompassing cultural, racial, ethnic, and other such factors. Lastly, it suggests the importance of recognizing one’s own biases as well as those of the patient and family, the treatment team and the societal environment, all of which are essential aspects of culturally competent rehabilitation psychology services.