“…Afuzzysetisasetofobjectsinwhichthereisnoclear-cutorpredefinedboundarybetweentheobjects thatareorarenotmembersoftheset (Kouah,&Saïdouni(2015).Thekeyconceptbehindthisdefinition isthatof''membership'':eachelementinasetisassociatedwithavalueindicatingtowhatdegreethe elementisamemberoftheset.Thisvaluecomeswithintherange[0,1],where0and1,respectively, indicatetheminimumandmaximumdegreeofmembership,whilealltheintermediatevaluesindicate degreesof''partial ''ofmembership(Bevilacquaetal.2006).Fuzzytheoryprovidestheconceptof membershipfunctiontoaddressvariouslanguagevariables (Zadeh,1965).Afuzzysetof a isdefined bythemembershipfunction µ a x ( ) andassignstoeachelementxin a anaturalnumber µ a x ( ) of interval[1,0].Thevalueoftheµ a x ( ) functioniscalledthedegreeofmembershipofxin a (Kaufmann &Gupta,1991).Fuzzysetprocessesshouldincludeadefuzzyingprocess.Inthisresearch,inorderto defuzzyingofthefuzzynumbers,weusedthecenterofgravityandYogermethods.Fuzzynumbers arebellshaped,triangular,trapezoidal,triangularL-R,andtrapezoidalL-Rnumbers.Thepresentstudy uses triangular fuzzy. These numbers are represented by triplets of the type a a a a = ( )…”