Congress passed the "Education for All Handicapped Children Act" in 1975 in response to the need for children with physical or mental disabilities to have proper access to educational opportunities. Basically, the Act requires all schools accepting federal funds to provide equal access to education for all children, regardless of disability.
The relevance or significance of the "Education for All Handicapped Children Act is that it ensured that, under the law, no child would be denied access to an education simply because he or she has some kind of physical or mental impairment that may preclude that child from participating in a regular classroom. Because it has long been established that the handicapped are more than capable of contributing to society when provided some extra assistance, and that the values and principles many Americans hold dear call for such opportunties and for equal treatment, the congressional mandate has proven beneficial both to the disabled and to society at large.
The relevance of this is that we have an ethical duty to provide a fair education to all people.
In our society, we provide free education to all people up through high school. We have taken it upon ourselves as a society to be responsible for educating all of our youth. At the same time, we are a country that believes in equal opportunity for all people. We believe that people should all be treated equally by the law. Therefore, it is relevant and important for us to provide a fair education for all people, whether they have disabilities or not.
This, of course, is easier said than done. It is very hard to know how to provide a fair education for people of all ability levels. It can be very difficult to accommodate students with special needs in a mainstream classroom in a way that allows them to have a fair education without detracting from the ability of other students to learn.
Because we want to treat everyone equally, and because we provide a free education to everyone, it is important and relevant to provide everyone with a fair education.