A play--a good one--is like a pressure cooker or a broken elevator (you all know the game)...these people you've created need to be kept together--no matter how much they ask you to let them separate. Your drama is in the moments they are forced to share. The longer they interact (which means what, "act between"?), the better chance you have of potent effects.

Dialogue corresponds to the pinnacles and pits of our daily experience. Though other encounters, with art or the wild or our own minds, can be brilliant and satisfying, they never parallel the humungous devastation, frustration or jubilation we take in from dialogue.