DPPM
Beginner
How many bad chips slip through out of every million shipped.
Novice
Defective parts per million: how many faulty chips reach customers for every million shipped. Car makers track it closely, with a goal of zero.
Expert
Driven down by high test coverage, outlier screening such as Part Average Testing, burn-in or stress screens, and design for test and analysis.
Explained in Automotive (Industries).