Abstract
In this paper, systematization is divided into system design, system improvement, system development, and system analysis, and the methods and effects of introduction of the functional component grouping process into each type of systematization are discussed. That is, firstly, the functional component grouping process, which is a method of establishing multilayered functional component grouping structures according to the basic policy of each systematization case, is discussed. Then the relationship between the process and each type of systematization from which various kinds of effects are gained, is also discussed.