Can anybody help me to understand the difference between design
selection methodologies that are based on fuzzy logic and simple
weighted score systems.
My understanding is that in a simple weighted score system the value
of the attribute for each criteria is compared to the range of values
for that attribute with a linear scale being used to determine the
score. Each score is then weighted (as depending on the relative
importance of each criteria) and summed to derive an overall score for
each design option. The overall scores then determine the ranking of
the design options.
In a fuzzy selection system various linear or non-linear relationships
are used to determine the raw scores from the attributes. The
calculation of the overall ranking is then much the same as for the
simple weighted score system. Thus, it is the calculation of the
scores that provides the fuzzy element, or degree of set membership,
in the methodology.
Am I correct in this thinking, or is there a degree of sophistication
that I have not realised.
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