IGCSE Information & Communication Technology Paper-1: Specimen Questions with Answers 6 - 6 of 45

Question number: 6


Appeared in Year: 2009

Essay Question▾

Describe in Detail

What are the main difference between conventional system and expert system?


  • Conventional systems are rule based systems. Rules are clearly defined and implemented in the programming language as to how the system should function and behave in certain condition.

  • An expert system is a computer system that emulates the decision-making ability of a human expert. Expert systems are designed to solve complex problems by reasoning through bodies of knowledge, represented mainly as if–then rules rather than through conventional procedural code.

Main differences:

Conventional system

  • Knowledge and processing are combined in one unit.

  • The system is operational only when fully developed.

  • The programme does not make errors, unless error in programming.

  • Step by step execution according to fixed algorithms is required.

  • It needs full information.

Expert system

  • Knowledge database and the processing mechanism are two separate components.

  • The Expert System may make a mistake.

  • The expert system is optimized on an ongoing basis and can be launched with a small number of rules.

  • Execution is done logically & heuristically.

  • It can be functional with sufficient or insufficient information.

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