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I worked on a relatively narrow part of a complex domain, I had an anki deck to keep track of the various acronyms and remember some of the weirder processes my systems participated in. Most of the questions were one of:

- what does ABC stand for

- describe process X

- how process X differs from Y, and why

- what is the role of system A in process Z

- what is the shape of data that comes from A to B in process Ł

This vastly reduced the number of times I got stumped with something during various high-level meetings (to the point that I routinely pointed out some false assumptions people made). It worked better for me than passive documentation. The domain was unusually complex though.