adiagnostic strategy.Engineers and technicians have long used decision-trees or trouble-shooting guides to assist thediagnostic process while identifying problems in technical systems. In our project we havechosen concept mapping developed by Novak. Although often time a complicated andtime-consuming knowledge acquisition process, conceptual mapping is nonetheless a good tool toportray knowledge structure and to diagnose learner’s misconception in learning. It has been usedin the development of agile diagnostic thinking skills of students who have limited contentexpertise 8,9,10,11 . For instance, Lee et al. applied the algorithm of Apriori for Concept Map todevelop an intelligent concept diagnostic system (ICDS) to provide teachers with