Hi !
BVA-(Boundary value Analysis)
it will focuses on “corner cases” or values that are 
usually out of range as defined by the specification.

ECP-(Equivalence Class partitioning)
drastically cuts down the number of test cases
required to test a system reasonably,to find the most 
errors with the smallest number
of test cases.


Correct me if i m wrong.
Mohammed Mustafa Hussain

Hi,

Equivalence partitioning and Boubdary Value Analysis are 
test case design techniques where we can find more bugs 
with less test cases.  
  What Mustafa explained was correct.

Sreelaxmi

BVA It refers Boundary Value Analysis and ECP for 
Equvalance Class Partioning.both are Black Box Technique.
In BVA we used 3 values in test data for example we test 
the digit 5000 means we split it in to 5000-1 and 5000+1.

In BVA, we concentrate on size of data i.e. range (Min, 
max, min-1, max-1, min+1,max+1), where as in ECP, we 
concentrate on type of data (valid, invalid).