Why does the boundary value analysis provide good test cases?

Boundary value analysis is effective because it focuses on the values at the edges of input ranges, where errors are more likely to occur. By testing at and around these boundaries, it captures potential off-by-one errors and other edge-related issues that might be missed with more uniform testing methods. This technique helps ensure that software behaves correctly at critical limits, thereby improving overall robustness and reliability. It leverages the principle that defects often manifest at the extremes of input ranges.