Due to business demands including cost cutting and schedule shortening, we see many software development projects that directly make software specifications without writing requirement specification. Such projects have many problems. This paper describes the ZC method which defines the requirement specification by visualizing the requirement features. In the ZC method, the objects to be developed are circled, and the relation among the objects are defined by lines: our empirical study discovered that a single A4 paper represents approximately 10 KLOC. We confirmed that the ZC method allwos software engineers to easily and precisely define the user's requirement. The ZC method is on the experimental stage, and we will attempt it in the actual projects.