“…After great development of production machines, technology of equipment, using of automated machines and robots in the firms, the process of manufacturing was shifted from workers to equipment, therefore the role of maintenance of equipment increased and turn out to be more important than before to give continual production and to reduce stoppage of equipment during operations, this was lead to control main options of quantity, quality, time, and cost of manufacturing equipment in the firms, and nowadays most academicians and technicians recognize that there is strong relationship between product quality and maintenance of equipment [20]. The new developments came also by interrelation between control chart and maintenance, it was maximized, and many studies affirmed that the actual integration between control chart and maintenance become more beneficial to firms, they determined jointly optimal design parameters on x-bar control chart and the loss of costs of maintenance procedures [21].…”