The U.S. Access Board is responsible for developing guidelines for the implementation of the ADA. The first Americans with Disabilities Act Accessibility Guidelines (ADAAG) were published in 1991. In Section 4.30.4 of this document, the parameters for the size and spacing of braille characters, even though they were being applied to braille signage, were exactly the same as those from the Library of Congress for braille embossed on paper.