1. Difficulties in Expert System Development
Scarce resources
new technology
demand for trained personnel
Development time
knowledge acquisition takes time
Errors

2. Errors in Expert Systems
Incorrect or incomplete knowledge
Human expert
Knowledge engineer
Knowledge base
Inference engine
User interface

3. Errors in Expert Systems
Human expert
Knowledge engineer
Knowledge base
Inference engine
User interface
Semantic errors in communication with the expert, knowledge gaps

4. Errors in Expert Systems
Human expert
Knowledge engineer
Knowledge base
Inference engine
User interface
Syntax errors in rules etc.

5. Errors in Expert Systems
Human expert
Knowledge engineer
Knowledge base
Inference engine
User interface
Bugs in the inference engine and/or development tool. Incorrect rule location in the knowledge base.

6. Errors in Expert Systems
Human expert
Knowledge engineer
Knowledge base
Inference engine
User interface
Incorrect in the content of the communication between the expert system and the user.

7. User Interfaces
User interface- hardware and software that facilitates communication and interaction between the user and the computers.
“User interface may be thought of as a surface through which data is passed back and forth between user and computer” [Turban 1995].

8. Interface Styles Command Language Menu Interaction Question and Answer
Form Interaction
Natural Language
Object Manipulation

9. Interface Styles Command Language Menu Interaction Question and Answer
Form Interaction
Natural Language
Object Manipulation
The user enters commands such as “run” or “plot”.
Some commands can be executed using function keys.
Hard to remember.
Fast for Experienced users

10. Interface Styles Command Language Menu Interaction Question and Answer
Form Interaction
Natural Language
Object Manipulation
The user selects from a list of possible choices(menu). Menus can be structured in a hierarchical nature.
Navigation can be slow.
All options are visible.

11. Interface Styles Command Language Menu Interaction Question and Answer
Form Interaction
Natural Language
Object Manipulation
The user is asked questions generated by the system.
The answers are provided by sentences or menu input.
Easy to implement
Hard to handle mistakes.

12. Interface Styles Command Language Menu Interaction Question and Answer
Form Interaction
Natural Language
Object Manipulation
The user enters data into designated spaces (fields) in forms.
Good for bulk data entry
Limited Options

13. Interface Styles Command Language Menu Interaction Question and Answer
Form Interaction
Natural Language
Object Manipulation
The user enters commands via natural language either by keyboard or voice. Still a long way to go.
Ease of use(?)
Ambiguity

14. Interface Styles Command Language Menu Interaction Question and Answer
Form Interaction
Natural Language
Object Manipulation
The user manipulates icons or symbols to input the necessary data.
Easy to use
Harder to Design
Icons must be recognisable