The four major enterprise applications are

There is no one single information system that will satisfy all of the needs of an organization. At first glance it can be difficult to comprehend all the different systems in a business, and even more difficult to understand how they relate to one another. You’ll learn the integral role each type of system plays - from determining which kind of product to make (strategic level systems); to how many people the company will need to make the product (management level systems); to tracking customer orders (operational level systems) at the end of this discussion. Within these three levels we’ll discuss the four major types of systems typically used to make an organization successful.

The transaction processing system (TPS) records the data from everyday operations throughout every division or department in the organization. Each division/department is tied together through the TPS to provide useful information to management levels throughout the company. The operational level of an organization includes various units such as order processing, material movement control, payroll, accounts payable, and employee record keeping. This level is responsible for daily operations.

Businesses and organizations collect billions and billions of pieces of data on everything from customers to suppliers to business partners. Collecting the data is the easy part – almost too easy. Once the data are collected, it's much more difficult for managers and executives to actually use them to make smart decisions. That conundrum has given rise to business intelligence software applications that help users make sense of all that data. Decision makers can discern hidden patterns and trends in the data and use the information to the organization's benefit.

Management information systems (MIS) are designed to produce information on a periodic basis instead of on a daily recurring basis like those using a transaction processing system. Managers also require information on an exception basis. That is, they need to know if production is higher or lower than the targeted rate or if they are over or under their budgets. They also need to know about trends instead of straight numbers. A management information system is used by managers throughout the organization to help them in directing, planning, coordinating, communicating, and decision making. The MIS will help answer structured questions on a periodic basis.

Decision-support systems (DSS) also serve the management level of an organization, but in a somewhat different way from management information systems. MIS use internal data to supply useful information. DSS use internal data but also combine it with external data to help analyze various decisions management must make. Decision-support systems are used for complex “what-if” questions that require internal and external data. Decisions at this management level are mostly semi-structured so the information system must respond to the unique requirements of the executives.

Executive support systems (ESS) are used at the very upper echelons of management. At the strategic level, the typical decision is largely unstructured. Executives require summarized, historical information gleaned from all other levels of the organization, coupled with large amounts of external data gathered from many sources. The executive support systems use digital dashboards to make the system easy to use and provide information in a real-time mode. In sum, they help managers make strategic decisions affecting the entire company. The decisions use internal and external data to give executives the information they need to determine the proper course of action in unstructured situations.