“…Proposed initially by Pawlak (1982Pawlak ( , 1991 and then by Pawlak and Slowinski (1994), the rough set theory is a mathematical tool devised to support decision--making processes. Since its introduction, it has been used in many fields such as medicine, banking, engineering, learning, location selection, pharmacology, finance, market analysis and economics (Pawlak, 2002;Greco et al, 1999Greco et al, , 2001Zaras, 2004;Zaras et al, 2012;Ho et al, 2016;Renaud et al, 2007;Marin et al, 2014;Prema and Umamaheswari, 2016;Songbian, 2016;Emam et al, 2017). It was later extended by Greco, Matarazo andSlowinski (2001, 1999) and renamed "dominance-based rough set approach".…”