Abstract
Quality assurance is one of the highest priority subjects on application system development projects. As the scale of system development grows larger, it rises higher, the degree of the difficulty of the quality assurance on its application system. And plus, if the development period is required to shorten, its degree of the difficulty rises even higher. In our real project of the practical application system development, we a chieved both aspects shortening development period and the quality assurance by performing the following countermeasure, load balancing for development engineers by the concurrent development of sub system, sharing a part of development work with client/user, reviewing specifications and corresponding user's requests of improvement as a basis.
