Great Schools
In-game
The Great Schools of the Imperium are the player will learn abilities from the Bene Gesserit, Swordmasters, Troopers, and Mentats.[1] [2]
At character creation, players will select what type of abilities they are born with, then as the game progresses the player can become "a specialized master or multi-talented adept"[1]
After character creation the player will be able to gain access to the other Great Schools via the Ability Trainers.