F.E.A.R.'s GOAP system uses a simplified Finite State Machine with only three states complemented by AI planning.

In F.E.A.R., the traditional finite state machine controlling NPC behavior was reduced to just three states: GoTo, Animate, and UseSmartObject. The AI planning system takes over the complex decision-making, determining which states to enter and in what order to fulfill goals. This architectural innovation streamlined development and created more emergent behaviors.