Every member of the project team is responsible for the quality of his or her work. Quality is the top priority. The reputation and the success of the project depend on the quality of the products and services delivered.
Quality is free.
The cost of avoiding defects is less than the cost of finding and correcting them. Rework is more expensive than prevention. Quality is internal. Quality must be designed and built into the system. It cannot be forced in through external inspections, and it cannot be tested in.