Boundary Value Analysis

Boundary Value Analysis is a testing technique that focuses on a system's behavior at the boundaries or "edges" of valid input data. The logic behind this approach is that most defects in an application occur at these boundary values, rather than with inputs in the middle of a range.

Example: For a software field that accepts an age between 18 and 65, a tester using Boundary Value Analysis would not just test an age like 35. Instead, they would focus on the boundary values and their adjacent numbers. This would involve testing the following:

• The minimum value: 18
• The value just below the minimum: 17
• The maximum value: 65
• The value just above the maximum: 66

This method helps ensure the system handles both valid and invalid boundary inputs correctly.