Fuzzy logic is a quite varied. The tutorial "Lab" here explores modes ponens using linguistic variables. The file should be placed in your jxxx directory in the subdirectory system|extras|labs|personal so that it does not collide with the earlier version in the subdirectory ...|general. The Lab is being placed here so that I can get feedback on this revision.
download a fuzzy logic lab: File:Fuzzylogic.ijt