Expert System

Expert System

1. What is it?

   • It is a software that attempts act like a human expert on a particular subject area
   • It is often used to advise non-experts in situations where human-experts are unavailiable

2. How do they work?

   • They have 3 parts
     • 1 .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.
     • 2. Knowledge base
       • his is a collection of facts and rules. The knowledge base is created from information provided by human experts
     • 3. Inference Engine
       • This acts rather like a search engine, examining the knowledge base for information that matches the user's query

3. Examples

   • Medical Diagnosis
     • in doctors surguries and hospitals
       • Help them diagnose patients correctly
       • Match symptoms with probable causes
       • Recommend actions doctors should take
     • Within websites
       • Help patients self-diagnose
       • Guides patients through questions which they can answer by clicking options or typing in boxes
       • The system will suggest a diagnosis and help the user decide if they should go to the hospital
   • Searching for oil and minerals reserve
   • Chess game
   • Identification of plant and animal species
   • Diagnosing cars' faults

4. Advatages

   • Fewer mistakes
   • More knowledge due to the combination of experts' knowledge
   • More consistent asnwers
   • Lowering labour cost

5. Disadvantages

   • The lack common sense so they can't make judgements
   • Errorsin the base lead to incorrect decisions
   • Require training, might be difficult for some people to use
   • Can't adapt to circumstances