Open the discussion with them, tell them where you are confused and have
them explain things to you.
If they can't explain it to you in a quick conversation; have them
document it. gModeler seems good [first time I saw it was 5 seconds
ago!], or any other UML-esque program that can build relationship diagrams.
Depending on the project, some aspects might need their own view, for
example: I've found it useful to document the event-model as a
completely separate view.
Hopefully once it's documented it will become easy to maintain.
:)
All the other tips given are solid; good luck!
Seb.
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