The Americans with Disabilities Act (ADA) has been extremely effective. As it is seen on the same level with Civil Rights Legislation passed in 1964, the ADA has transformed how individuals define "disability" and how inclusion in society is vitally important to the Constitution's promises and possibilities in its extension to all citizens.
The ADA's inclusion of voice is where its greatest effectiveness is seen. The Act is responsible for ensuring that millions of people are included in the general setting. The increase in accessibility in public areas as well as transforming the definition of "disability" is where the Act's effectiveness is most evident. Given that one out of every five Americans has some type of condition that falls under the Act's definition of "disability," its effectiveness cannot be denied.
Increasing availability of "accommodations" is another realm where the Act has been most effective. Particularly in realms like education and employment, legal documentation of medical conditions ensures that individuals are less likely to experience institutional discrimination--for a condition no fault of their own--that could be eliminated by accommodating the disability. The Act's demand ensuring that professional settings make these accommodations is another realm where its effectiveness can be seen.