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Difference between DSS and Expert System

  • Last Updated : 25 Aug, 2020
Geek Week

1. Decision Support System (DSS) :
It’s a computer based system that aids the process of decision making. It is an interactive, flexible and adaptable computer system. It is especially developed for supporting the solution of a non-structured management problem for improved decision making.

DSS are a specific class of computerized information system that supports business and organizational decision-making activities.

Advantages :

  • It saves time.
  • Enhances efficiency
  • Reduces the cost
  • It improves personal efficiency
  • It increases the decision maker satisfaction.

Disadvantages :



  • Information Overload
  • Status reduction
  • Over-emphasize decision making.

2. Expert System :
It is a computer program that is designed to mimic the decision-making ability of a decision-maker.

It organizes a set of knowledge about a particular subject. It contains facts and judgmental knowledge which gives it the ability to guess like a human. There are set of rules on which it make decisions using if-else structure. The inference engine does reasoning by manipulating the knowledge base. The user interface represents questions and information to the operator and also receives answers from the operator.

Advantages :

  • Cost is reduced
  • Danger is reduced
  • Increases the availability
  • Performance

Disadvantages :

  • It can make absurd errors if data is entered incorrectly.
  • Doesn’t provide creative response in certain situations.
  • It relies on rules and knowledge being correct.



Difference between DSS and Expert System :

DSSExpert System
It facilitates decision-making.It automates decision-making.
The decision environment is unstructured.The decision environment have structure.
It extracts or gains knowledge from a computer system.Inject expert knowledge in to a computer system.
Characteristics of the problem domain is complex and broad.In this, it is limited and specialised.
Type of data manipulation is numeric.Type of data manipulation is symbolic.
It has limited capacity.It has a full capacity.
It uses goals and system data to establish alternatives and outcomes, so a good decision can be made.The expert system can eventually replace the human decision maker.

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