“…al, 1993), (Phatak, 1995), (Piuri et. al, 1991) and (Tchernev and Phatak, 2005) deal with models to evaluate and represent fault tolerance; (Arad and El-Amawy, 1997) and (Cavalieri and Mirabella, 1999) consider different solutions for improving fault tolerance and (Bolt, 1991), (Eickhoff et. al, 2005), (Elsimary et.…”