Planning in pluralistic societies implies to propose measurements in situations of dissent and unsolved conflicts. Insofar it is congruent with the domain of politics, inclusive the involvement in the network of effects on existing or awakened, mostly divergent interests. In the resulting case of conflict, their respective representatives try to influence the plan – by their arguments in a rational discourse and by means of power. However, argumentation itself turns out to be a mean of power: As their agents try to push through themselves against resistance, they definitively enter the mechanisms of power acting. Following these considerations, a power model of planning is developed, with its logical structure, its calculi, means and instruments, as it is embedded in its societal conditions, with its ethical positions and including trials to hinder its misuse by procedures.