A character's perk rate determines how often the player character gets to choose a new perk (or an additional level for an already obtained one). In Fallout, Fallout 2 and Fallout Tactics, the player character can choose a perk every three levels, with Fallout Tactics offering different rates for non-human characters. When choosing the Skilled trait, the perk rate is reduced so that the player character can choose a perk every four levels. In Fallout 3, Fallout 4 and Fallout: Brotherhood of Steel, the player character gets to choose a perk (or skill) at every level. In Fallout: New Vegas, the perk rate is set at every 2 levels.