Task Acquisition with a Description Logic Reasoner

In many knowledge based systems the application domain is modeled in an object centered formalism Research in knowledge acquisition has given evi dence that this approach allows one to adequately model the conceptual struc tures of human experts However when a novice user wants to describe a particular task to be solved by such a system he has to be well acquainted with the underlying domain model and therefore is charged with the burden of making himself familiar with it We aim at giving automated support to a user in this process which we call task acquisition This paper describes the tacos system which guides a user through an object centered domain model and gives support to him in specifying his task A characteristic of tacos is that the user can enter only information that is meaningful and consistent with the domain model In order to identify such information tacos exploits the ability of a description logic based knowledge representation system to reason about such models on leave from the Institute of Computer Science Polish Academy of Sciences Warsaw Poland