 The impact that disability has on each domain is largely a function of the view or model of disability one accepts. Disability scholars and philosophers of disability now refer to two models of disability, the medical and the social (see  SEP entry on disability: definitions, models, experience).  For present purposes, we understand the social model of disability as holding that the physical and social environment are the primary source of the limitations and disadvantages faced by people with almost all impairments. This model has obvious relevance for the accounts of well-being, health, and personal relationships we will examine. It suggests that if people with disabilities appear to be unhappy, unhealthy, or socially isolated, it is primarily due to contingent features of their physical and social environments, not to any intrinsic features of their impaired functions. In some cases, this recognition will require a reassessment of their present well-being, health, or social relationships. In other cases, it will not challenge that assessment, but will alter the prescription for improving their well-being, health, or relationships, or the expectation of success in doing so.