In the New World of Aldous Huxley's novel, there is a caste system that originates from artificially contrived births in the Central London Hatchery and Conditioning Center. These castes are assigned letters of the Greek alphabet in descending order of intelligence: Alpha, Beta, Gamma, Delta, and Epsilon. All but the Alphas and Betas undergo the Bokavonsky Process which involves shocking an egg so that it divides into ninety-six separate human beings. These Gammas, Deltas, and Epsilons also have oxygen deprivation in order to dumb them down since they are designed for the lesser tasks of the society, such as operating machinery. While they are children, these castes also receive sleep conditioning, or hypnopedia. Betas, for instance, are taught to hate Gammas and Deltas, who wear green and khaki. Lenina, a Beta-Minus who is a vaccinator at the Hatchery remarks that she hates khaki several times in the narrative. Gammas are often machine-minders, butlers, and other moderately thinking jobs. Epsilons, the darkest race, are the ones who do mindless tasks, such as operating elevators. The Predestinators determine how many humans will be needed
Holding the managerial positions, the Alphas and Betas are also divided as Alpha-Pluses such as Helmholtz, who is the "emotional engineer" in charge of writing propaganda to keep people established in their proper beliefs, and Bernard Marx, who is a psychologist.Foster, also an Alpba, works closely under the Direcor of the hatchery; he is a contented Alpha.
The Beta pluses or minuses differ slightly from one another. Lenina and Fanny are good friends, and both suffer from lupus, a disease of the related young women. In order control the masses, soma is handed to everyone.