WEAPON FOCUS
Type: Combat, Tier 1.
Prerequisite: Proficiency (Simple Weapons).
Benefit: Select one type of weapon that you're proficient with. You gain a +3 class bonus to attack rolls you make with the selected weapon.
Special: This can be taken multiple times, applying to a new selection each time.

IMPROVED WEAPON FOCUS
Type: Combat, Tier 2.
Prerequisite: Proficiency (Simple Weapons), Weapon  Focus.
Benefit: You apply your bonus from Weapon Focus to AC, CMD, and Reflex against attacks that attempt to disarm or sunder the weapon. In addition, you are treated as having Quick Draw for any weapon benefiting from your Weapon Focus feat.

GREATER WEAPON FOCUS
Type: Combat, Tier 3.
Prerequisite: Proficiency (Simple Weapons), Weapon Focus, Improved Weapon Focus.
Benefit: You are treated as having the Critical Focus and Improved Critical feats but only for weapons that benefit from your Weapon Focus feat.