IGCSE Information & Communication Technology Paper-1: Specimen Questions with Answers 26 - 27 of 46

Question number: 26

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Appeared in Year: 2009

MCQ▾

Question

Which of the following statements state the limitations of expert system

Choices

Choice (4)

a.

Not widely used or tested.

b.

Extremely reliable

c.

Cannot refine own knowledge base

d.

Both a. and c. are correct

Answer

d.

Explanation

The statement Not widely used or tested. and Cannot refine own knowledge base. states the limitations of expert system.

An Expert System is defined as an interactive and reliable computer-based decision-making system which uses both facts and heuristics to solve complex decision-making problems. It is considered at the highest level of human intelligence and expertise. It is a computer application which solves the most complex issues in a specific domain. Along with many advantages it also has certain limitations, which are the following:

  • Not widely used or tested.

  • Possibility of error.

  • Difficult to maintain.

  • May have high development costs.

  • Limited to relatively narrow problems.

  • Cannot readily deal with mixed knowledge.

  • Cannot refine own knowledge base.

  • Raise legal and ethical concerns.

  • Knowledge is not always readily available.

Question number: 27

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Appeared in Year: 2009

MCQ▾

Question

Which among the following specifies characteristics of expert system?

Choices

Choice (4)

a.

It helps to distribute the expertise of a human.

b.

They use a knowledge base and inference engine.

c.

Can’t produce correct result from less amount of knowledge.

d.

Both a. and b. are correct

Answer

d.

Explanation

  • The statements It helps to distribute the expertise of a human. and They use a knowledge base and inference engine. specify characteristics of expert system. 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.

  • The main characteristics of expert system include:

    • Human experts are perishable but an expert system is permanent.

    • It helps to distribute the expertise of a human.

    • One expert system may contain knowledge from more than one human expert thus making the solutions more efficient.

    • It decreases the cost of consulting an expert for various domains such as medical diagnosis.

    • They use a knowledge base and inference engine.

    • Expert systems can solve complex problems by deducing new facts through existing facts of knowledge, represented mostly as if-then rules rather than through conventional procedural code.

    • Expert systems were among the first truly successful forms of artificial intelligence (AI) software.

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