Directional influence (usually abbreviated DI, which can be used as a verb) is the control the target of an attack has over its trajectory in Super Smash Bros. Melee. Each attack sends its target in a particular direction, depending on the attack itself and on the target's weight and falling speed; DI can be used to alter, but not completely change, this trajectory. This change, however, can be vital to surviving high-power attacks such as Fox's up smash, and for escaping combos such as Jigglypuff's Space Animal Slayer.