Title: The Knowledge Acquisition and Representation Language, KARL
Description: The <em>Knowledge Acquisition and Representation Language KARL</em> is a formal and operational specification language for knowledge-based systems and second-generation expert systems. KARL provides language primitives to represent knowledge according to the layers of a KADS-oriented model of expertise. The main features of KARL are: it provides <em>epistemologically</em> adequate modelling primitives that allow knowledge specifications at the knowledge level. Therefore, KARL allows a smooth transition from informal to formal specifications. KARL is a <em>formal</em> knowledge specification language. That is, it has a declarative semantics. KARL is an <em>operational</em> knowledge specification language that allows prototyping, i.e. knowledge evaluation by testing. <br/>