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Typically, the initial document is detailed and well laid out, but it is as we build on it that it quickly becomes stale.
Often, we're relying on one or two particular people with very strong domain knowledge who have been here since the inception of the system to do our checks and balances and work out what we really need to implement.
This is a problem I've seen in a number of places, but it's particularly cumbersome here. How have you managed it?