independent Verification is Static testing and system 
environment.
validation is Dynamic testing.Actual testing start in 
validations.like funtional testing and system testing.

verification is nothing but to check whether our 
application is based on corresponding s/w specifications or 
not?

validation is nothing but to check whether our application 
functionality is equal to customer requirements or not?

Verification is nothing but checking the correctness of 
every documet stage before application is developed.

Validation is nothing but checking the correctness of 
developed application.