PickTwo

Context : TypesOfThinking

Cute way of representing problems with constraints. Hence

• ShirkysLaw : equality, fairness, opportunity ... pick two

or

• the engineer's maxim : on time, on budget, as specified ... pick two
  • Contrast TheMythicalManMonth, sometimes projects are not fungible enough to be able to trade "budget")

Of course, there's also "Pick One" as in "NuclearEnergy : safe and cheap ... pick one"