VATS

The Vault-Tec Assisted Targeting System, or V.A.T.S.is a queuing system for Fallout 3, inspired partly by the ability to target specific body parts in the turn-based combat system of Fallout and Fallout 2.

While using V.A.T.S., the otherwise real-time combat is paused. Various actions cost action points, and both the player and enemies can target specific body areas for attacks, inflicting specific injuries.

When using V.A.T.S. against a humanoid enemy, there are generally seven different that are targetable; the head, torso, left arm, right arm, currently held weapon, left leg, and right leg. However, there may be other points available when specifically facing off non-humanoid creatures (I.E. Bloatfly wings, Ant's Antenna). When targeting a part, the screen displays a percentage of how likely the attack will hit the targeted area based on distance from the target, and combat skill. Unlike previous Fallout games, it is not possible to target the eyes or groin nor target any individual body parts in melee and unarmed combat (In the case of Melee and Unarmed, the VATS only targets the enemy's head).

It is also possible to target a thrown grenade before it reaches you.

VATS is introduced to the player character on their 10th birthday in the vault upon receiving a BB gun.