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Chapter 4

ELICITATION METHODS

Concerning membership functions, two main trends are detected in the experimental research. One branch tries to experimentally validate the postulates of fuzzy set theory. The other branch adopts a certain interpretation of the concept of the ‘grade of membership’ and then seeks ways to elicit them. Mainly, there has been six ways used in experiments with the aim of constructing membership functions (Norwich and Türken 1982b, Chameau and Santamarina 1987a, Türken 1991): polling: In this method, the analyst asks the ...

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