This is all manageable from the perk chart screen within the Pip-Boy. Every rank of the SPECIAL attributes and perks costs 1 perk point. This point can be expended on an increase in the rank of a primary SPECIAL attribute, or on one of the SPECIAL perks. Each time the player character gains a level they gain a perk point. The new perk system of Fallout 4 has merged with the skill system of previous games.