The purpose of this research was to design and develop a new multi-criteria decision- making (MCDM)  method called Fuzzy Decision by Opinion Score Method (FDOSM) to  help  overcome  the  problems  of   MCDM  methods  based  on  the  idea  of  an  ideal solution This research used an experimental  research design with which FDOSM was applied  to  individual  and  group  contexts.  Essentially,   FDOSM  contains  three  main blocks, namely the input data block, data transfer block, and data  processing block. For the data processing block, three sets of experiments were carried out to  optimize the parameters  of the  proposed  method.  The  first  experiment  dealt  with  three   different configurations,   namely   Direct   aggregation,   Compromise   Rank,   and   Distance  measurement, of a single decision maker. Direct aggregation with arithmetic mean is the   main    configuration   recommended   for   compa.....

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