 'Compellence', in contrast to 'deterrence', shifts the initiative for the first action to the coercer.While deterrence means waiting passively in hope of not seeing a response, compellence is active, thereby, "inducing his withdrawal, or his acquiescence, or his collaboration by an action that threatens to hurt".When differentiating between deterrence and compellence, deterrence can be described as "drawing a line in the sand" and acting only if the adversary crosses it; in contrast, compellence "requires that the punishment be administered until the other acts rather than if he acts" as in deterrence.