The six major types of information systems corresponding to each organizational level (the four levels shown in figure above) are:
1. Transaction Processing Systems (TPS): serve the operational level of an organization.
2. Knowledge work systems (KWS)
3. Office automation systems (OAS) to serve the knowledge level of an organization.
4. Decision-support systems (DSS)
5. Management information systems (MIS) serve the management level of the organization.
6. Executive support systems (ESS) serve the strategic level of an organization.
(Source: Management Information Systems, Laudon and laudon, http://www.uh.edu/~mrana/try.htm)
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