The boundary value analysis is a technique for testing the boundary value of an equivalence class partition. A boundary value analysis identifies errors at the boundaries, opposed to WITHIN ranges in equivalence partitioning.  

Example: Consider an input field in an application that can accept a minimum of 5 characters and a maximum of 10 characters. We were able to SPLIT our test CASES into three equivalence classes COMPOSED of invalid and VALID input. Then 5-10 is considered as valid and <4 and >10 is considered as invalid. 

Test cases for application input field accepting numbers between 5-10 using boundary value analysis: 

• The valid partition: Between values 5-10 (For this test case, we will use the same test data as the input boundaries of the input domain, namely values 5 and 10). 
• The first invalid partition: <5 (The test data value for this case will be just below the edge/boundary of the input domain, i.e., value 4). 
• The second invalid partition: >10 (The test data value for this case will be just above the edge/boundary of the input domain, i.e., value 11).