The Americans with Disabilities Act and Section 504

Access Board
U.S. Access Board (formerly the Architectural and Transportation Barriers Compliance Board).
DOJ
U.S. Department of Justice.
DOT
U.S. Department of Transportation.
OCR
Office for Civil Rights; for example, OCR at the U.S. Department of Education.
ADA Standards (“the Standards”)
The ADA Standards for Accessible Design, issued by DOJ in 1991 (with some later amendments).
The proposed standards
ADA Standards proposed in June 2008 by DOJ for title II and title III through an NPRM (notice of proposed rulemaking).No final standards have resulted; the proposal was subject to public comment, revised for review by the Administration, and is now under review within DOJ again.
ADAAG
Americans with Disabilities Act Accessibility Guidelines (developed by the Access Board).The ADA says that federal ADA accessibility standards, which are issued by DOJ and DOT, must be at least as stringent as these.
“Original” ADAAG or 1991/1994 ADAAG
DOJ and DOT adopted these, word for word, as standards for the ADA.
“New” ADAAG or 2004 ADAAG
Guidelines developed by the Access Board and issued in 2004.In June 2008 DOJ proposed to adopt the 2004 ADAAG as new ADA Standards for title II and title III.DOT adopted the 2004 ADAAG as new ADA Standards in 2008.
ANSI
American National Standards Institute.ANSI is a private group that has developed many technical “industry standards” or “consensus standards,” including ANSI A-117.1 (accessible buildings and facilities).The 1961 ANSI Standard was the original standard under the Architectural Barriers Act and section 504.
IBC
International Building Code.This is a private “model code,” also developed by a private group, the ICC (International Code Council). A number of state and local governments have adopted the accessibility portion of the IBC, in whole or in part.
UFAS
The Uniform Federal Accessibility Standards, issued in 1984, originally for purposes of new construction and alterations under the Architectural Barriers Act.