Nolan, an American management information system expert, put forward a famous information system evolution stage model-Nolan model by summarizing the practice and experience of more than 200 companies and departments in developing information systems.
Nolan believes that when any organization develops from manual information system to computer-based information system, there are objective development paths and laws. From 65438 to 0979, Nolan divided the development of computer information system into six stages. Nolan emphasized that when any organization realizes a computer-based information system, it must develop from one stage to the next, and it cannot achieve leap-forward development.