Political-military simulations take a different approach to their purely military counterparts. Since they are largely concerned with policy issues rather than battlefield performance, they tend to be less prescriptive in their operation. However, various mathematical techniques have arisen in an attempt to bring rigor to the modeling process. One of these techniques is known as game theory—a commonly-used method is that of non-zero-sum analysis, in which score tables are drawn up to enable selection of a decision such that a favorable outcome is produced regardless of the opponent's decision.