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What tasks does each caste in Brave New World carry out?

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In Brave New World, each caste carries out different tasks. Alphas, the leaders and thinkers, do intellectual work and occupy high positions or work as administrators and managers. Betas perform lower-level managerial and higher-level technical functions. Gammas are top-level servants and semi-skilled workers, essentially forming the top of the working class. Deltas, often grouped with Epsilons, do factory work, producing basic components for machines. Finally, Epsilons, the only illiterate class, perform the most basic tasks, such as sewage work or serving as lower-level servants.

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The Alphas are the thinking class and seem to be made up entirely (or almost entirely) of men. These are the university-educated types who run society. They are the tallest group—or are supposed to be—reflecting their position of authority in society. As the text notes:

Gammas, Deltas and Epsilons had been to some extent conditioned to associate corporeal mass with social superiority.

The Betas, who seem to be primarily women, are the next highest caste. They have critical thinking skills to an extent but are not of the intellectual caliber of the alphas. They are the lab technicians, simple problem solvers, and semi-professional workers of the society, and they provide a convenient pool of sexually willing women for the Alphas to sleep with.

The Gammas are the highest level of the three lower (or mass) classes and are the highest caste to be birthed in identical batches. They are factory workers and, because of the amount of time they have to spend in an industrial setting, are conditioned to hate nature, as are the other lower castes.

Deltas are also factory workers, but they have lower intelligence than the Gammas. One group of Deltas is described as "almost noseless [and] black."

The Epsilons are the lowest and least intelligent caste in the World State. They are the shortest and darkest, too, reflecting the racism of Huxley's time period. They perform the most menial tasks in society and are the group that are "hatched" in the largest batches, as their individuation is unimportant.

The book does little to differentiate between the Gammas, Deltas, and Epsilons except to make them progressively smaller, darker, and less intelligent. They are all factory workers and menial laborers.

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In Aldous Huxley's Brave New World, there are five genetically-dictated castes that inhabit the New World.  In the supposed utopia, these predestined humans are named after the letters of the Greek alphabet:  Alphas, Betas, Gammas, Deltas, and Epsilons. 

ALPHAS

The upper castes such as the Alpha Pluses and Alphas are bred for managerial positions.  They have been given creative powers, but they have been conditioned to abhor books and nature.  The Director of the Hatchery is an Alpha, for example, as are Bernard Marx and Helmholtz.

BETAS

Not as intelligent as Alphas, Betas also can be minuses and pluses.  They have had some decanting (reducing of the oxygen), but are able to hold jobs that require intelligence.  Lenina is a Beta.  Like other Betas and Alphas, Lenina is taught to hate Gammas, Epsilons, and Deltas.  She makes the comment that she is glad that she is a Beta

because they're so frightfully clever.  I'm really awfully glad I'm a Beta, because I don't work so hard.  And then we are much better than the Gammas and Deltas.  Gammas are stupid.  They all wear green, and Delta children wear khaki.  Oh no, I don't want to play with Delta children.   And Epsilons are still worse.  They're too stupid to be able..."

GAMMAS - this caste is dressed in green

DELTAS - this caste is dressed in khaki and other castes are conditioned to hate khaki.

EPSILONS - this group has very little intelligence.

The Gammas, the Deltas, and the Epsilons have the menial jobs.  There are many of them bred to do these jobs such as running elevators and cleaning floors.

All the groups are conditioned through electric shock and hypnopoedia, sleep conditioning.  Sexual entertainment is also encouraged in the new world.

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