The SMEs would be evaluated based on the main criteria, secondary criteria, and
sub criteria as demonstrated in Figure 4.2. For the sub criteria, Boolean, Categorical, and
Scales are three types of questions to be asked. Boolean questions can be answered as
either Yes or No. Categorical questions can be answered with values from 1 to 5. Scaled
questions, which accept answers of a numerical nature, are usually enforced in ranges in
which responses should fall.