Optimization for multiple objectives (multi-objective
optimization)
has attracted significant attention from academia, particularly in
the last 2 decades. It provides a set of optimal solutions (known
as Pareto-optimal solutions). Multi-criteria decision making (MCDM)
is necessary to rank and choose one of the optimal solutions for implementation.
The overall purpose of this paper is to investigate extensively the
sensitivity of MCDM methods including the phenomenon of rank reversal.
The research evaluates the effect of three modifications, namely,
linear transformation of objectives (LTO), reciprocal objective reformulation
(ROR), and removal of alternatives (RA) in the decision or objective
matrix (DOM) of alternatives, on the ranking of Pareto-optimal solutions.
The basic design of the study includes the use of 8 MCDM methods,
2 weighting methods (namely, entropy method and Criteria Importance
Through Intercriteria Correlation, CRITIC method), and DOM datasets
of 16 diverse applications from engineering. The major findings of
the study are as follows. First, certain MCDM methods such as gray
relational analysis (without any weights), combinative distance-based
assessment (coupled with entropy weights), and simple additive weighting
(coupled with entropy or CRITIC weights) are less sensitive to the
three modifications in DOM for the applications studied. Second, the
results show that weights calculated by the entropy method are more
sensitive to LTO, ROR, and RA, compared to those by the CRITIC method.
Third, ROR has the largest effect on ranking by MCDM methods for all
of the applications studied. These findings are useful for the application
of MCDM as well as for further research.