[slykar]

> By talking to people on a regular basis?

So it's like keeping data in a RAM instead of a persistent storage. Does not sound like a good practice. I would also say it does not scale.

The advice I usually hear from people running software houses is to have an internal KB. Even experts forget what they told 3 months ago or how the complex process was supposed to go like.

> How would you find out who the experts are and where they are?

Team Directory. Write down who knows what and how to reach them. People figure out in small, focused groups who knows what by seeing who delivers. You don't need to do it in a hallway.