Most of the MADM and MCDM studies integrate their models with fuzzy logic. They're based on experts' opinions to study and solve some problems. What is the minimum acceptable experts' number in the fuzzy logic studies? And what is the experts' number threshold at which we can take the average instead of fuzzy calculations?
Dear Saleh,
Unfortanly, there is not a minimun number for how many experts are necessary for a acceptable work.
In the validation process, many times, the researcher use some expert's perceptions instead of mass perceptions for two main reasons: i) It is better, because experts know what they are talking about; and ii) It is easier then collect data from more people.
What the researchs usally do is describe how important an representative the experts in the group are. You will believe in the answer because you will believe in the experts.
You can try to calculate a confidence interval, but in the reliability tests you will fails, because expert's use to have the same (or close to) opinions.
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