- The TruckNumber is the size of the smallest set of people in a project such that, if
*all*of them got hit by a truck, the project would be in trouble.

- The TruckNumber is the size of the smallest set of people in a project such that, if
*one*of them got hit by a truck, the project would be in trouble.

- The size of the
*largest*set of people in a project such that, if*one*of them got hit by a truck, the project would be in trouble.

Some comments about the "smallest group such that if all the members of it were hit by a truck, the project would be in trouble" definition: Note that, in effect, the truck gets to pick who it will hit. A related metric, then, would allow the project to pick who will be hit: "the largest group such that if all the members of it were hit by a truck, the project would still not be in trouble". As with the truck-gets-to-pick definition, smaller is still worse and larger is still better (though the min is now 0

I describe this concept to the boss as the project being "bus and fire-proof", which I translate for him as "if I get hit by a bus, or you decide to fire me, the project goes on". --TrippLilley?

Been thinking about this recently. I've always thought of TruckNumber like this: If X people got hit by a truck, would the project be in trouble? Substitute any number for X, and you have a 'yes' or 'no' for that number. The TruckNumber, then is the smallest number whose answer to the question is 'yes'. However, it

1 2 Amy Y N Bob N Y Cal Y N Don N YThe worst-case TruckNumber is 2, but the expected TruckNumber is 2.67. If Amy were to learn module 2, the worst-case would remain 2, but the expected TruckNumber would improve to 3.0833.

How about a TruckPercentage?? This would be the Trucknumber of your team, divided by the size of your team. Thus a TruckPercentage? of 1 is good (the whole team needs to be wiped away for the project to be in danger), while your TruckPercentage? approaching zero would be bad. -- AalbertTorsius. Reading this some years later, I realise I was talking about either a TruckFactor or I meant a TruckPercentage? of 100, not 1. --ATS.

Here's a relevant story: http://www.folklore.org/StoryView.py?project=Macintosh&story=I_Still_Remember_Regions.txt Ah, FolkloreOrg.

See: TruckNumber, MoreFunWithTruckNumbers

I think that most projects would be in trouble if even one person were hit by a truck or otherwise left the project. It might be more useful to measure

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