I also put this in password's topic NEW BLOG - What is "the truth"?
At work, we are governed by the International Standards Organization creed as follows:
1) Do what you say.
2) Say what you do.
3) Prove it.
We cannot obtain contracts with certain large companies such as banks, insurance companies, and governments without the certification. We have to have a Quality Management System that includes change and problem management, continual improvement, and problem prevention. We must document our processes and metrics. We must adhere to the 3 principles outlined above or we lose our Certification -- and our clients. We conduct peer review audits annually. Periodic external audits are also conducted.
The WTS would NEVER acquire ISO Certification.