tailieunhanh - Chapter 4 Requirements Management

Tham khảo tài liệu 'chapter 4 requirements management', công nghệ thông tin, cơ sở dữ liệu phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 4 Requirements Management CONTENTS PROCESS Requirements Requirements Process Change Requirements Requirements Specification Requirements traceability REQUIREMENTS ENGINEERING Requirements Requirements February 2003 4-1 Chapter 4 Requirements Management Condensed GSAM Handbook This page intentionally left blank. 4-2 February 2003 Chapter 4 Requirements Management Introduction The goal of any endeavor is defined by its requirements. Requirements define the purpose of a project and are the foundation of the project plan. The stated requirements will determine what is to be produced or achieved. One of the primary reason software projects fail is because requirements are incomplete or incorrect. 1 If the requirements are not done right the project will probably fail no matter what is done in subsequent phases. 2 Incomplete or defective requirements result in inaccurate product descriptions and erroneous cost and schedule estimates which in turn deliver an unusable product. What is not asked for will not be produced and what is asked for will be produced even if it s not needed. Table 4-1 shows the relative costs of fixing software requirements defects in different phases of the project. Whatever it may cost to do things right in the requirements phase it will be 3 to 1000 times more costly to fix later if not done right. Phase in Which Fixed Relative Cost Requirements 1 Design 3 - 6 Coding 10 Development Testing 15 - 40 Acceptance Testing 30 - 70 Operations 40 - 1000 N System or J_K__ Stlmulu Com ponen pResP nse Figure 4-1 Functional Requirements Table 4-1 Relative Costs

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