performed in next stage. In fourth stage, modification in the
set of questionnaire is performed. After the completion of
modification process, the fifth stage builds an interface with
human experts or specialist engineers to conduct new & fresh
surveys. In sixth stage, the results of received information is
confirmed with human experts. In next stage knowledge is
extracted from the gathered and retrieved data and then
inserted into a knowledge base, which is arranged in the form
of decision tree. To form the decision tree a forward chaining
method is used. Above discussed process is depicted in the
form of flow chart in Fig. 3.