Boundary Value Analysis is a black-box test technique in which test cases are designed based on boundary values.

Boundary value analysis and testing will reveal almost all such defects by forcing the software to show behaviors from a partition other than the one to which the boundary value should belong.

This technique is used when practically it is impossible to test a large pool of test cases individually

For example: Test scenario — A text field accepts input between 1 to 100

Test Scenario Description	Expected Outcome
Boundary Value = 0	System should NOT accept
Boundary Value = 1	System should accept
Boundary Value = 2	System should accept
Boundary Value = 99	System should accept
Boundary Value = 100	System should accept
Boundary Value = 101	System should NOT accept