Expert Systems Knowledge Based Systems Difficulties in Expert

Expert Systems Knowledge Based Systems Difficulties in Expert System Development u Scarce – – resources new technology demand for trained personnel u Development – time knowledge acquisition takes time u Errors

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

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

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

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

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

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

Expert Systems Knowledge Based Systems Interface Styles u Command Language u Menu Interaction u Question and Answer u Form Interaction u Natural Language u Object Manipulation

Expert Systems Knowledge Based Systems Interface Styles u Command Language u Menu Interaction u Question and Answer u Form Interaction u Natural Language u 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

Expert Systems Knowledge Based Systems Interface Styles u Command Language u Menu Interaction u Question and Answer u Form Interaction u Natural Language u 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.

Expert Systems Knowledge Based Systems Interface Styles u Command Language u Menu Interaction u Question and Answer u Form Interaction u Natural Language u 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.

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

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

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