How many types of information system in business organization?

Information systems differ in their business needs. Also depending upon different levels in organization information systems differ. Three major information systems are

1. Transaction processing systems

2. Management information systems

3. Decision support systems

The information needs are different at different organizational levels. Accordingly the information can be categorized as: strategic information, managerial information and operational information.

Strategic information is the information needed by top most management for decision making. For example the trends in revenues earned by the organization are required by the top management for setting the policies of the organization. This information is not required by the lower levels in the organization. The information systems that provide these kinds of information are known as Decision Support Systems.