The Nuclear doctrine of State of Pakistan (otherwise referred as Option-enhancing Policy (OeP); or simply: Nuclear doctrine;), is a theoretical concept of military strategy that promotes the deterrence by guaranteeing an immediate "massive retaliation" to an aggressive attacks against the state. This doctrine obtained various mathematical models of the "Game theory" for its effective operational use; it is consisted of numbers of set of strict principles (roughly based on Game theory, Nash equilibrium and parts of the Decision theory), rules, regulations, and comprehensive instructions for the operational employment or non-operational employment of atomic weapons and other strategic systems associated with those weapons.