Waterfall Model: It includes all phases of SDLC but the 
drawback is once requirement made freezed it cannot be 
changed.

V-Model: In this model all phases will be done 
correspondently development and testing etc.....

generally speaking waterfall model is used for desktop 
applications and v-model is used for both desktop and web 
based applications

In Waterfall model,testing is carried out once the code has 
been fully developed.Each work-product or activity is 
completed before moving on to next.

In V-model,gives realtionship between each development 
stages and Testing stages.
Once the basis for testing has been produced ,planning and 
prepration can begin

As most of you have said, In the waterfall model each sterp 
is frozen before the next step. that is the requirements 
are frozen before the design starts, and once the design is 
frozen the coding starts etc. But what will the testing 
team do till then?????
  In V model, based on the requirements the System test 
cases are prepared, and based on the HLD (High level 
document)the Integration Test cases are prepared, and based 
on the LLD(Lowlevel document)the Integration Test cases are 
prepared. and then the coding is done. once coding is 
completed, unit, integration and system testing happens in 
the sequence.

in v model developer and tester works paralally.in the case 
of waterfall model it's not possible.In the case of 
waterfall model after finishing off all the models tester 
start testing

waterfall model-waterfall model is very time consuming and 
high costing......



v-model-v-model is not to much time consuming and high 
costing and it is a process oriented