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
Makes
recommendations
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
Domain-Specific
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.
Applications
Best suited
for those dealing
with expert heuristics
for solving
problems.
‡ 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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