Why are requirements
Why are requirements
important ?
important ?
需求为什么重要？
需求为什么重要？
The causes of failed projects
The causes of failed projects
（项目失败的主要原因
（项目失败的主要原因
1994 Standish
1994 Standish
）
）
–
1. Incomplete requirements (13.1%)
1. Incomplete requirements (13.1%)
–
2. Lack of user involvement (12.4%)
2. Lack of user involvement (12.4%)
–
3. Lack of resources (10.6%)
3. Lack of resources (10.6%)
–
4. Unrealistic expectations (9.9%)
4. Unrealistic expectations (9.9%)
–
5. Lack of executive support (9.3%)
5. Lack of executive support (9.3%)
–
6. Changing requirements and specifications
6. Changing requirements and specifications
(8.7%)
(8.7%)
–
7. Lack of planning
7. Lack of planning
(8.1%)
(8.1%)
–
8. System no longer needed
8. System no longer needed
(7.5%)
(7.5%)
不完整的需求
缺少用户的参与
缺少资源
不切实际的期望
缺乏行政支持
改动需求和规格说明
缺少计划
不再需要该系统
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