Very thought provoking. When tacit knowledge leakage is mentioned I often think of my 94 year-old Dad who spent 30 years in the Navy working up from the boilerroom/fireroom on the battleship Mississippi in 1939 to chief engineer on the carrier Forrestal when he retired in 1969. His knowledge was great but when he saluted for the last time as he retired, all that tacit knowledge went with him. I'm sure there are some flooded firerooms that might not have flooded if the knowledge could have been captured/shared/used.