The first national interior designers association was called the American Institute of Decorators (AID), founded in 1931. It was later named the American Institute of Interior Designers, appellation remained unchanged, (AID). It is the oldest professional association for interior designers. In 1975 (AID) and the National Society of Interior Designers (NSID) merged to become the American Society of Interior Designers (ASID). Its more than 40,000 members engage in a variety of professional programs and activities through a network of 48 chapters throughout the United States and Canada.