Comment by lordnacho

Too much emphasis on documentation. It's people that matter.

If you build the sort of culture where people hang around, they will occasionally have time to tell each other the internal folklore. "When I started, an old guy told me about the plug under the canal".

People who work with software know this. Yeah, there are documents describing the system. No, reading them does not mean you understand the system.

Alas, it's an intangible, and doesn't get counted with the rest of the beans.