Why people with disabilities have been less included and less involved in society?

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These reasons are barriers that are faced regularly by people with disabilities and are both intrinsic and extrinsic in nature. Intrinsic barriers result from a person’s own physical, psychological, or cognitive limitations. These are real barriers that are usually permanent, but they may sometimes be temporary. Regardless of the duration, intrinsic barriers reduce a person’s ability to be involved in a normative society. What compounds the intrinsic barriers are the countless extrinsic barriers faced by people with disabilities. Extrinsic barriers (sometimes called environmental barriers) are things external to people with disabilities that impose limitations upon them.