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tribal knowledge

/ˈtraɪbəl ˈnɒlɪdʒ/ - n.

1 [colloq.] The real documentation, sharded across the people most likely to resign.Keep. Punchy.This is the problem.

Working definition

2. Operational understanding held informally in people's heads rather than in documentation or systems.

Filed

See also

bus factorUsually one, usually unaware, usually about to take leave.
data dictionaryA faithful description of the column named 'cust_status_2_final', whose meaning died with its author.
documentation debtThe distance between the wiki and the warehouse, compounding every sprint and paid by whoever onboards next.