V Model mean

 REquirement                                        Integration                     

    Prototype                                  Unit testing   

       Designing                    Integartion testing

           Integration       Acceptence testing              

V-Model means verfication and validation.It include following phases:

1.Requirement

2.Design(high level designing)

3.Detailed Design&Build(Low level Designing)

4.Component testing

5.Assembly Testing

6.Product Testing

7.User Acceptence Testing

8.Opertional Testing

V-Model indicates that how the testing is carried out.

Order         Phase 1                      Order    Phase 2

1              Requirement Analysis    4         System Integration  
2              Low Level Desgin            3         Unit Testing
3              High Level Design           2         Integration Testing
4              System Integration        1          User Acceptance Testing