Abstract: The authors extended the representing framework Rof the KRA model so as to divide the perception into primary perception and abstraction perception. In the process of primary perception,Wunder the primary perception system P is mapped as P(W) where the attributes of the objects in Wdo not change. In the process of abstraction perception, Wunder the abstraction perception system P^* is mapped as P^*(W). The objects in P^*(W)are abstraction objects, the types of which are related to the abstraction objects database predefined by the agent. The specified modeling process can generate various abstraction models of W, making the reasoning simplified.

Key words: abstraction model, general KRA abstraction model, pri mary perception, abstraction perception 