Industrial engineering is concerned with the design, improvement and installation of integrated production systems of people, material, equipment and energy. If industrial engineers were to present one concept to describe their field of interest and objective, it would have to be productivity improvement. Recently, industrial engineering has been recognized as an indispensable factor for improving efficiency in many other areas. Industrial engineers are expected not only to take charge of production management, process control and quality management in industry, but also play an important role as researchers or consultants in various systems engineering areas.