An expert system is a computer application that performs tasks that would otherwise require human expertise. It uses a knowledge base of rules provided by human experts, and an inference engine that reasons through the rules to solve problems, similar to how a human expert would. To create an expert system, a knowledge engineer studies how human experts make decisions and translates that knowledge into rules for the computer. The system is then tested using sample problems to validate it can provide accurate solutions.

1. Expert System
Muhammad Rizwan
rizsoft@gmail.com

2. What is an Expert System?
A computer application that performs a task that would
otherwise be performed by a human expert. For example,
there are expert systems that can diagnose human
illnesses, make financial forecasts, and schedule routes for
delivery vehicles. Some expert systems are designed to
take the place of human experts, while others are designed
to aid them.
Expert systems are part of a general category of computer
applications known as artificial intelligence . To design an
expert system, one needs a knowledge engineer, an individual
who studies how human experts make decisions and
translates the rules into terms that a computer can
understand.

3. What is an Expert System?

4. Expert System
The rule base or knowledge base
In expert system technology, the knowledge base is expressed
with natural language rules IF ... THEN ... For examples :
"IF it is living THEN it is mortal"
"IF his age = known THEN his year of birth = current year his age in years“
The inference engine
The inference engine is a computer program designed to
produce a reasoning on rules. In order to produce a
reasoning, it should be based on logic.

5. What is an Expert System?

6. Steps taken to create & test Expert System
Get information from experts
Input data into knowledge base
Populate rule base
Create interface engine
Create human-machine interface
Test system with “known” problems and there solutions
Create output screens/format
Create/design validation routine