Truck Factor (definition): "The number of people on your team who have to be hit with a truck before the project is in serious trouble"
Clearly "hit by a truck" is an extreme thought however you could easily substitute "take vacation at the same time" to get the same idea. If any part of your project has a truck factor of one then you are in a particularly fragile situation. If that one person leaves or is unable to work on the project, you will suffer the consequences.
Over time, anyone can be replaced. Truck factor is an indication of how expensive it will be to replace specific people.
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