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Because Asimov wrote the series over several decades, there are two primary ways to read it:

A roadmap designed to shorten the upcoming "dark ages" from 30,000 years to just 1,000 years after the inevitable fall of the Galactic Empire. Because Asimov wrote the series over several decades,

(Then prequels): Prelude to Foundation , Forward the Foundation Key Concepts for the Guide 000 years to just 1