keyword:  

V-Model

description:   It is a picture of "V" plots each phase name in the waterfall model.
1.Requirements Definition
2.Basic Design
3.Detail Design
4.Development
5.Unit Test
6.Integration Test
7.User Acceptance Test

The phases above can be expressed as a character of "V" as following;
1   -   7
 2  -  6
  3 - 5
    4

This is a thought that each downstream test phase should extract test conditions from its corresponding upstearm phase.
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