n the manufacturing industry in recent years, great progress has been made in the area of production innovation prior to actual production, including virtual product design using 3D CAD, or simulations of assembly processes as opposed to relying on production prototypes. However, as workers are the key to raising productivity on a production line, it is difficult to perform verification in virtual environments, necessitating a resort to a process of trial-and-error on the production line in order to improve efficiency.With GP4, users at the production preparation stage can create a virtual production line and run simulations on factors including the most efficient movements or positions of production workers, the optimal alignment of workers in relation to the flow of a production line, and the time required to complete specific production tasks. As a result, in addition to enabling greater efficiency in assembly work on a production line from the standpoint of people, the product enables workers to benchmark their work against the simulation results and share their understanding of problem areas with co-workers, leading to improvements on the front lines of assembly plants.