This NIST Enterprise Architecture Model references enterprise architecture from the late 1980s. The interrelationship between an enterprise's business, information, and technology environments define enterprise architecture. The National Institute of Standards and Technology and others developed this reference model in the late 1980s, and the federal government of the United States promoted it in the 1990s as the foundation for enterprise architectures of individual U.S. government agencies as well as the overall national enterprise architecture. The NIST Enterprise Architecture Model is a five-layered enterprise architecture model intended for organizing, planning, and constructing an integrated set of information and information technology architectures. The five layers are defined independently, but they are interconnected and interwoven. The NIST Enterprise Architecture Model was born in the fifth workshop in 1988.