Yup, one of the engineering axioms.I just want to clarify the universe of defects. There are essentially two types of defects. The first is defined as a Common Cause. Translated it refers to a defect that is inadvertently designed into the product. It could be a dimensional, material, manufacturing process, etc., that is shown on the detail drawings. Most manufacturers have a tough time admitting to common cause defects.
The second kind of defect is called Special Cause. Examples are parts purchased from suppliers that are out of specification like Springs with improper heat treat, castings with porosity, etc. Manufacturers love to blame their product defects on somebody else. They can sue them for the cost of recalls and production delays. Lose of reputation…..not so much.
There's a whole process called design verification (DV) that should be very strict and disciplined. Usually short cuts are taken because marketing is pushing production and release timing. What happens is the science experiment ends up on the customers back. I recall way to many internal fights over three variables: low cost, fast timing, and high quality. My response was "pick any two. You can't schedule invention and you can't compress time." Forgive my long sermon. Tom H.
We can make it better, faster, cheaper - pick any two.