TAILIEUCHUNG - Software Engineering For Students: A Programming Approach Part 37

Software Engineering For Students: A Programming Approach Part 37. This fully revised version of Doug Bell's Software Engineering: A Programming Approach continues to use the successful formula of the previous editions. The author's approach is to present the main principles, techniques and tools used in software engineering, one by one, chapter by chapter. This book is a unique introduction to software engineering for all students of computer science and its related disciplines. It is also ideal for practitioners wishing to remain current with new developments in the area | 338 Chapter 27 The unified process Meeting the user s needs requires no explanation. The second aim of the UP recognizes that there are always risks associated with a development. Examples are changes in user requirements and deadline overruns for components of the software. These can seriously disrupt a project or even cause it to be abandoned. To meet its aims the UP makes use of a number of techniques including use cases iteration and emphasis on the architecture of the software. A use case describes in natural language a small self-contained function that the system provides for the user. A collection of use cases specify the requirements for a system. Use cases were discussed in Chapter 4 on requirements engineering. The UP mechanism for coping with risk is to proceed iteratively. This means that an initial plan is constructed. Then some small amount of development is carried out. Next the outcome is assessed. In the light of the evaluation a new plan is devised or in the worst case the project is abandoned . The UP also emphasizes getting the architecture of the software right. By architecture is meant the grand-scale structure of the software. For example in a web-based solution what components run on the server and what components run on the client What type of database is to be used In summary the method makes heavy use of use cases iteration software architecture. The UP consists of four phases inception elaboration construction and transition. We will now explore what they involve. Phases of the UP The UP consists of four phases inception elaboration construction and transition as shown in Figure . We shall see later that within each phase are a number of iterations. The four phases are in outline Phase 1 inception This consists of a feasibility study to establish whether the proposed system is worthwhile. We discussed how to carry out feasibility studies in Chapter 3. An outline of the major requirements is established. A decision is made to .

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