the memory an organization keeps in people, not in files, and loses one retirement at a time.
means the accumulated knowledge of why things are done a certain way, held informally by long-tenured staff rather than written down anywhere official.
from the phrase gained currency in 20th-century management and archival circles once organizations noticed that firing or retiring senior employees made whole processes mysteriously stop working.
nasa apollo knowledge — engineers who built the saturn v retired, leaving gaps for artemis decades later
vatican archives — centuries of bureaucratic memory kept by clerks, not just documents
ibm mainframe teams — cobol expertise held by aging staff still runs bank systems in 2024
family owned firms — recipes and supplier deals passed down only through owners, undocumented