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|Why six preference function types?|
From the introduction of the PROMETHEE methods by Professor J.-P. Brans in 1982, six types of preference functions have been defined.
They were based on previous methods such as ELECTRE III (linear criterion) or on preference modelling structures (usual, U-shape and level criterion).
The Decision Lab and Visual PROMETHEE software extend these six types by allowing the user to define variable thresholds (percentage).
Other types of preference functions can of course be considered and there have been research works in that way (search the bibliographical database for references). However they are not currently implemented in PROMETHEE software.
However in most practical applications, the six preference types provide the decision maker with a sufficient level of flexibility.
- the usual criterion is used for qualitative criteria with few evaluation levels,
- the level criterion is used for qualitative criteria when it is felt necessary to modulate the preference degree,
- the linear criterion is used for quantitative criteria expressed on a continuous scale (like price for instance). The V-shape criterion is a special case when there is no indifference threshold (q).
The U-shape and Gaussian criterion are less often used.
Last update: 06:26 AM Thursday, December 22, 2011
© Bertrand Mareschal, 2011-2013. All rights reserved.