After the hierarchical structure has been established,
anther questionnaire on the basis of the propose structure
is formulated. The questionnaire surveys are used to compare
pairs of elements of each level with respect to each element in the next higher level.We use 7-point scale, and that
will be easy to answer. To avoid getting subjective results,
in each questionnaire, the interviewee will be asked to select
the lower value, mean value, and upper value to each question.
Then fuzzy AHP methods are adopted relied on the
triangular membership function. The questionnaires also
target on the evaluated experts mentioned in Section 3.4.
To integrate different experts’ opinions, the following formulas
are applied