The first level of OA system-transactional OA system is widely used in word processing, electronic typesetting, spreadsheet processing, file sending and receiving login, electronic document management and so on. Its function is to handle daily office affairs and directly face the office staff.
The secondary information management OA system is a comprehensive office information processing system that closely combines transactional OA with comprehensive information (database) with the increasing importance of information utilization. In order to optimize daily work and improve office efficiency and quality, modern governments, enterprises and institutions must have a comprehensive database for all departments of their own units, which is based on transaction-level OA system and constitutes an information management OA system.
The third layer decision support OA system is based on information management OA system. It uses the information provided by the comprehensive database system to build or select a decision-making digital model for the subject who needs to make decisions, and combines internal and external conditions, and the computer executes the decision-making program and makes corresponding decisions.
With the maturity of network communication technology, computer technology and database technology, office automation in the world has entered a new stage, in which the system has four new characteristics: integration, intelligence, multimedia and the use of electronic data exchange.