I mean that you can't just shove them into this kind of a working mode, then into some other kind, as would say a teenager play around with shifting from 2nd up

I mean that you can't just shove them into this kind of a working mode, then into some other kind, as would say a teenager play around with shifting from 2nd upto 5th the first time he gets to drive his dad's Mazda all by himself. Which is about the same degree of attachment expressed in the idea that a project manger can "shift" programmers into and out of pair programming mode the way one would work a stickshift. Working habits are intensely personal, idiosyncratic things. People -- by which I mean creative, productive, self aware & self-managing people; i.e. the only kind you should ever hire -- almost by definition don't like being pushed into working one way or another. Or being simply told what works best (because X or Y said so).