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. External inspection and test simply indicate the absence of quality. The people on the project must build quality into the products and services they deliver. Improvement is a continuous process .