First Author:   Amit Shelef Department of Industrial Management, Sapir Academic College, Israel amitshe@mail.sapir.ac.il   D.N. Hof Ashkelon , 7916500, Israel       Second Author: Edna Schechtman Ben Gurion University, Beer Sheva, Israel ednas@bgu.ac.il   Ben Gurion University, Ben Gurion University Beer Sheva, 84105, Israel   97286472596(Phone) 97286472958(Fax)