[marcosdumay]

Well, there is a transition at something around 20, and another transition at larger numbers too (no idea where exactly, but 500 is above the transition).

I find it interesting that everybody focus on the transition at 100. (Except for educators, that are completely aware of the 20 one.)

[mistermann]

Would be interesting to know what people in the strategy department of the US military know about this topic.

[ghaff]

Certainly you can look at the sizes of various units in the US Army.

https://www.defense.gov/Multimedia/Experience/Military-Units...

Of course, they have various considerations that may not apply more generally.

[Bluestein]

Group size as a variable must have been studied to death from the military, HR and OR angles ...

[Bluestein]

20 is totally a "thing".-

PS. Manywhere, average classroom size is 30ish ...