References

Quality is never an accident. It is always the result of intelligent effort.

Quality is free. It’s not a gift, but it is free. What costs money are the unquality things—all the actions that involve not doing jobs right the first time.

If you don't care about quality, you can meet any other requirement.

You cannot inspect quality into a product.

There are two ways to write error-free programs; only the third one works.

The bitterness of poor quality remains long after the sweetness of meeting the schedule has been forgotten.

Discovering the unexpected is more important than confirming the known.

Program testing can be used to show the presence of bugs, but never to show their absence!