“…Different methodologies for the development of knowledge-based systems (where knowledge acquisition and modelling play a leading role) have emerged during the past 15 years. We can mention in particular methodologies such as KADS (Schreiber, 1993), VITAL (Domingue, 1993), REFLECT (Reinders, 1991), (van Harmelen, 1992), ACKnowledge (van Heijst, 1992), CommonKADS (Schreiber, 2000) and KATEMES-MultiExp (Ladibi, 1995). KADS and VITAL focus on the development cycle of a knowledge-based system, REFLECT proposes theories and architectures for reflexive systems, ACKnowledge introduces directive models for knowledge modelling.…”