The main purpose of this paper is to present KAOS', an Object-Oriented Software Tool built as an implementation of the ObjectOriented Model OASIS developed at the Information Systems and Computing Department of the Technical University of Valencia and based on the Object-Oriented Specification Language OASIS2. KAOS is a first prototype that offers the fimctionality of an Object-Oriented, Deductive and Active Database Management System, built over KBMS 1, a Knowledge-Rase Management System.