Expert System Characteristics
Expert system operates as an interactive system that responds to questions, asks for clarifications, makes recommendations and generally aids the decision-making process.
Expert systems have many Characteristics :
Operates as an interactive system
This means an expert system :
Responds to questions
Asks for clarifications
Aids the decision-making process.
Tools have ability to sift (filter) knowledge
Storage and retrieval of knowledge
Mechanisms to expand and update knowledge base on a continuing basis.
Make logical inferences based on knowledge stored
Simple reasoning mechanisms is used
Knowledge base must have means of exploiting the knowledge
stored, else it is useless; e.g., learning all the words in a language, without knowing how to combine those words to form a meaningful sentence.
Ability to Explain Reasoning
Remembers logical chain of reasoning; therefore user may ask
for explanation of a recommendation
factors considered in recommendation
Enhances user confidence in recommendation and acceptance of expert system
A particular system caters a narrow area of specialization;
e.g., a medical expert system cannot be used to find faults in an
electrical ci uit.
Quality of advice offered by an expert system is dependent on the amount of knowledge stored.
Capability to assign Confidence Values
Can deliver quantitative information
Can interpret qualitatively derived values
Can address imprecise and incomplete data through assignment of confidence values.
Best suited for those dealing with expert heuristics for solving
‡ Not a suitable choice for those problems that can be solved using purely numerical techniques.
Cost-Effective alternative to Human Expert
Expert systems have become increasingly popular because of their specialization, albeit in a narrow field.
Encoding and storing the domain-specific knowledge is economic process due to small size.
Specialists in many areas are rare and the cost of consulting them is high; an expert system of those areas can be useful and cost-effective alternative in the long run.
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