The engineer who knows where everything is

The most fragile part of certified design isn't the documentation. It's the person who knows where everything is. Every DOA has one — the engineer who has been there long enough to know "by instinct" which compliance items are genuinely closed and which are closed-but-watch-it. Who knows the history behind a particular design choice taken years ago and that still lives today in the latest version of your design, 100 installations later. Who can answer in two minutes a question that would take anyone else two days to research. This person is enormously valuable. They are also a single point of failure. When they leave — or move to a different area of the company or programme — the knowledge doesn't transfer automatically. What transfers is the documentation. And the documentation, without the context, is often not enough. This is not a criticism of how DOAs work. It is a structural problem that emerges naturally in any knowledge-intensive environment where the primary system of record is a set of documents rather than a structured, queryable knowledge base. The question worth asking is: if your most experienced certification engineer left tomorrow, how long would it take the company to recover its full situational awareness?