InformationSystem+In+the+Entrpise


 * Information system in the Enterprise **

** Major types of system in organization **

** The main categories of information systems serve different organizational level **
 * Operational level systems **
 * Management level system **
 * strategic level system **


 * Operational level system: **

Support operational managers by keeping track activities and transactions of the organization such as sales receipts, cash deposits. The principle purpose of systems at this level is to answer routine questions and to track the flow of transaction through the organization.

Some management level system support non routine decision making. These systems often answer "**what if" questions .**
 * Management level system ** serve the monitoring controlling ,decision making and administrative activities of the middle managers.

Help senior management tackle and address strategic issues and long –term trends both in the firm and in the external environment. Their principle concern is matching changes in the external environment with existing organizational capability. Information system also serve the major business functions, such as sales and marketing ,manufacturing and production , finance and accounting , and human resources.
 * Strategic level systems **

There is four major types of systems : 1-The organization has ** executive support system (ESS) ** at the strategic level. 2-**Management information system** ** (MIS ** ) 3-and **decision support system** (** DSS ** ) at the management level. 4-**Transaction processing system (TPS ** ) at the operational level.

A transaction processing system is a computerized system that perform and records the daily routine transaction necessary to conduct business.
 * TPS ** (**Transaction processing system**) : are the basic business systems that serve the operational level of the organization.

Typically, **MIS** are oriented almost exclusively to internal ,not environmental or external events they serve the functions of planning ,controlling and decision making at the management level.
 * Management information system **** (MIS ** ): providing managers with reports and often online access to the organizations current performance historical records.
 * MIS ** summarize and report on the company's basic operations.
 * MIS ** generally provide answer to routine questions that have been specified in a advance and have a predefined procedure for answering them.

DSS help managers make decisions that are unique rapidly changing and not easily specified in advance. Although DSS use internal information from TPS and MIS ,they often bring in information from external sources. Some times you will hear DSS system referred to as business intelligence system because they focus on helping users make better business.
 * Decision support system (DSS) **

Senior managers use (ESS) to help them make decisions. ESS employ the most advanced graphics software and can present graphs and data from many sources. They also draw summarized information from internal MIS and DSS.
 * Executive support system: (ESS) **