tailieunhanh - Chuyển từ yêu cầu để thiết kế

Làm việc trong giai đoạn thiết kế có thể bắt đầu sau khi phân tích các yêu cầu của một hệ thống phần mềm trong giai đoạn phân tích yêu cầu. Trước khi bắt đầu công việc trong giai đoạn thiết kế, bạn cần phải xác định ranh giới hệ thống và phạm vi của dự án của bạn để bạn có thể hoàn thành dự án trong khoảng thời gian quy định. Ngoài ra, bạn cần phải tinh chỉnh hệ thống định nghĩa, được tạo ra bằng cách sử dụng sơ đồ trường hợp sử dụng trong giai đoạn. | Migrating from Requirements to Design Work in the design phase can start after analyzing the requirements of a software system in the requirements phase. Before starting work in the design phase you need to Chapter 4 so determine the system boundaries and the scope that you can complete the project within the specified time period. In addition you need to refine the system definition which was created by using use case diagrams in the initial stages of the development process. This chapter discusses how to determine the system boundaries and the project scope. In addition it explains how to refine the system definition by refining the use case diagrams. Objectives In this chapter you will learn to fl Set the system boundaries and project scope fl Refine the system definition Setting Boundaries and Project Scope In the requirements modeling phase you create a use case diagram to depict the base level interaction among the actors and use cases of the proposed system. In the design phase you identify the iterations in which each requirement will be implemented. In addition you create use case diagrams to depict the interaction among the use cases and actors in each iteration. The use cases and actors defined for a particular iteration might be different from the use cases and actors defined for another iteration of the system. To depict the functions in terms of use cases and actors you set the system boundaries for each iteration of the system. In addition when you design a complex system you may need to divide the system into independent sub-systems. In such a case the system boundary enables you to clearly demarcate which sub-system is being modeled. After you set the system boundary you need to establish a scope for the software system. The scope includes estimating the resources required to complete a project within the stipulated time. Identifying System Boundary The system boundary enables you to focus on the functions performed by the software system in each .