

There are 4 skill books for each skill, except Science which has a fifth book as a quest reward ( Dead Money adds additional books, giving a total of 5 each, except Science which now has 6 and Survival which receives no additional book).

During the quest Ain't That a Kick in the Head, you will choose three skills to receive a one-time boost of 15 points. Initial skill levels are determined by your primary stats.
