Nearly all product work is done by teams of three people.
Three’s company
Jason Fried

Three is a great number indeed! From practice I have noticed that it is the best way to achieve collaboration, especially when you may have differing views in approaches — you can hardly have stalemates in a group of three, the math doesn’t allow it. Having the constraint also puts you in a position to think of features/work that is easily handled by as few people as possible.

Oh and this is a great strategy to reduce/eliminate meetings!

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