Different there are different types of decision support system and these are as Model driven, data driven.
Model Driven:
A model driven decision support system is primarily stand-alone systems isolated from major organizational information systems that use some type of model to perform “what if” and other kinds of analyses. The analytical capabilities of model driven DSS are based on a strong theory or model combined with a good user interface that made the model easy to use.
A model driven decision support system is primarily stand-alone systems isolated from major organizational information systems that use some type of model to perform “what if” and other kinds of analyses. The analytical capabilities of model driven DSS are based on a strong theory or model combined with a good user interface that made the model easy to use.
Data Driven:
The data driven decision support system analyze large pools of data found in major organizational systems. Often data from transaction processing system are collected in data warehouse
for this purpose. They support decision making by allowing users to extract useful information that was previously buried in large quantities of data.
The data driven decision support system analyze large pools of data found in major organizational systems. Often data from transaction processing system are collected in data warehouse
for this purpose. They support decision making by allowing users to extract useful information that was previously buried in large quantities of data. 
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