Testing proves a programmer’s failure. Debugging is the programmer’s vindication.

Software never was perfect and won't get perfect. But is that a license to create garbage? The missing ingredient is our reluctance to quantify quality.

A design remedy that prevents bugs is always preferable to a test method that discovers them.

More than the act of testing, the act of designing tests is one of the best bug preventers known.

Bugs lurk in corners and congregate at boundaries.

A test that reveals a bug has succeeded, not failed.

Extra features were once considered desirable. We now recognize that 'free' features are rarely free. Any increase in generality that does not contribute to reliability, modularity, maintainability, and robustness should be suspected.