FUSIM

FUSIM from Shen and Leitch in their paper [10] extends QSIM [4] so that qualitative variables can take fuzzy qualitative values. Transitions from one qualitative state to another are represented by rules. Successors are filtered to eliminate behaviours which are inconsistent with the relationships holding among variables. Besides the simulation result may contain spurious behaviour the envisioning tree is still to wide for considering complex systems.