What is the primary focus of Boundary Value Analysis testing?

Boundary Value Analysis (BVA) is a testing technique that specifically targets the inputs and outputs at the edges of what is defined as acceptable or valid ranges. The principle behind BVA is that errors are more likely to occur at the extreme ends of input value ranges, including just below and just above those boundaries.

For instance, if a system accepts input values between 1 and 10, BVA would focus on testing the values 0, 1, 10, and 11. By doing so, it aims to identify any potential issues that arise right at the limits where the system should transition from one state to another. This method enhances the likelihood of uncovering edge case defects that might not be found through typical testing approaches, which may focus on values comfortably within the valid range.

Thus, the primary focus is on identifying errors that occur at boundaries, making it a crucial aspect of effective testing practices.