ABSTRACT
Due to the introduction of computers and automated tools, manufacturing and production systems have become increasingly complex (Sheridan, 2002). Although the automation of manufacturing systems may have the effect of removing some employees from the shop floor, those who remain get greater responsibilities. They supervise a production system, they participate in the planning and scheduling of production, they exercise quality control, and sometimes they take responsibility for ordering and deliveries. In this complex environment, human errors can have serious consequences.
