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I'm not saying we purposely introduced bugs or anything, but this is kind of a natural result of any complexities of software... that you can't fully test it.

Running the test suite like this allows us to catch problems when they are just introduced.

I found out that most programmers don't like to test their software as intensely as I do.

Yet we still see continuous reports of bugs.

Writing software that's safe even in the presence of bugs makes the challenge even more interesting.

The reality of most software development is that the consequences of failure are simply nonexistent.

A well installed microcode bug will be almost impossible to detect.

The fundamental problem with program maintenance is that fixing a defect has a substantial chance of introducing another.

As a rule, software systems do not work well until they have been used, and have failed repeatedly, in real applications.

Defect-free software does not exist.