(i) Frames:- Used to describe a collection of attributes that a given object
possesses (eg: description of a chair).
(ii) Scripts:- Used to describe common sequence of events(eg:- a restaurant
(iii) Stereotypes :- Used to described characteristics of people.
(iv) Rule models:- Used to describe common features shared among a set of rules
in a production system.
Frames and scripts are used very extensively in a variety of AI programs. Before selecting any specific knowledge representation structure, the following issues have to be considered.
(i) The basis properties of objects , if any, which are common to every problem domain must be identified and handled appropriately.
(ii) The entire knowledge should be represented as a good set of primitives.
(iii) Mechanisms must be devised to access relevant parts in a large knowledge