A particular case is defined to cover specified problem
domain. Then, symptoms that are likely to occur and its
diagnosis results are defined in that problem domain.
Symptoms definition processes are followed by several
questions to identity some facts that occur. Diagnosis result
definition processes consist of conclusion statements and given
solutions or suggestions. After symptoms and its possible
diagnosis are defined, knowledge engineers are able to
construct rule structure into a decision tree that consists of
several linked nodes. Figure 6 illustrates an application form
for constructing the rule base.