[MichaelZuo]

> Design iteration is typically a long tail phenomenon - new issues keep coming up as the system (car) faces new scenarios. Even a high-resource prototyping program can only go so far with scenarios like - wear and tear/part fatigue, adverse environmental conditions, local peculiarities (e.g. regulatory requirements for uncommon configurations), unintended but common maintenance mistakes etc.

Which is why automakers typically recommends a maintenance schedule that catches the vast majority of potential failures before they occur on the road.

How does this, or anecdotes of your family's Fiat, relate to engineering and verification practices of parts coming in from suppliers?