What is an Expert System?
An expert system is computer software that attempts to act like a human expert on a particular subject area.
They are often used to advise non-experts in situations where a human expert in unavailable.
How Do Expert Systems Work?
An expert system is made up of three parts:- A user interface - This is the system that allows a non-expert user to query (question) the expert system, and to receive advice. The user-interface is designed to be a simple to use as possible.
- A knowledge base - This is a collection of facts and rules. The knowledge base is created from information provided by human experts
- An inference engine - This acts rather like a search engine, examining the knowledge base for information that matches the user's query
Where are they used?
- Medical diagnosis
- Chess Game
- Diagnose with fault cars
- Searching for mineral and oils reserves
- etc...
Advantages:
- Fewer mistakes
- More knowledge than a single expert
- More consistent answers
Disadvantages:
- No common sense
- No judgement
- Error in the rule base may lead to incorrect decision
- Requires a lot of training before users can use the software.
5 steps to make an expert system.
I . Interview
K . Knowledge base
I . Interference
U . User Interface
T . Testing
