See also: Feats
You are especially skilled at using weapons that can benefit as much from Dexterity as Strength.
Prerequisite: Base Attack Bonus +1
Effect: When using a Light Melee Weapon or a Lightsaber, you may use your Dexterity modifier instead of your Strength modifier on attack rolls.
Additional Weapon Finesse Effects Edit
Reference Book: Star Wars Saga Edition Knights of the Old Republic Campaign Guide
Combined Feat (Weapon Focus): When you are wielding a single one-handed weapon for which you have Weapon Focus, you can treat that weapon as a Light Weapon.