The social model of disability identifies systemic barriers, derogatory attitudes, and social exclusion (intentional or inadvertent), which make it difficult or impossible for disabled people to attain their valued functionings. The social model of disability diverges from the dominant medical model of disability, which is a functional analysis of the body as a machine to be fixed in order to conform with normative values. While physical, sensory, intellectual, or psychological variations may result in individual functional differences, these do not necessarily have to lead to disability unless society fails to take account of and include people intentionally with respect to their individual needs. The origin of the approach can be traced to the 1960s, and the specific term emerged from the United Kingdom in the 1980s. The social model of disability seeks to redefine disability to refer to the restrictions caused by society when it does not give equitable social and structural support according to disabled peoples' structural needs. As a simple example, if a person is unable to climb stairs, the medical model focuses on making the individual physically able to climb stairs. The social model tries to make stair-climbing unnecessary, such as by making society adapt to their needs, and assist them by replacing the stairs with a wheelchair-accessible ramp. According to the social model, the person remains disabled with respect to climbing stairs, but the disability is negligible and no longer disabling in that scenario, because the person can get to the same locations without climbing any stairs. History Disability rights movement There is a hint from before the 1970s that the interaction between disability and society was beginning to be considered. British politician and disability rights campaigner Alf Morris wrote in 1969 (emphasis added):The history of the social model of disability begins with the history of the disability rights movement. Around 1970, various groups in North America, including sociologists, disabled people, and disability-focused political groups, began to pull away from the accepted medical lens of viewing disability. Instead, they began to discuss things like oppression, civil rights, and accessibility. This change in discourse resulted in conceptualizations of disability that was rooted in social constructs. In 1975, the UK organization Union of the Physically Impaired Against Segregation (UPIAS) claimed: "In our view it is society which disables physically impaired people. Disability is something imposed on top of our impairments by the way we are unnecessarily isolated and