Furthermore, variations in individual perceptions and personality mean that the
same words can indicate very different perceptions. Consequently, the use of
binary logic and crisp numbers to describe these human perceptions or attitudes
(e.g., “strongly agree” = 2, “agree” = 1, “neutral” = 0, “disagree” = −1, and
“strongly disagree” = −2) fails to address fuzziness.27 In this case, a better approach
should be based on the use of linguistic assessments instead of numerical values.