This document discusses readability and factors that affect how easily material can be understood. It covers three general factors: the material itself, the reader, and the purpose for reading. For the material, it examines aspects like content, format, organization, and writing style. For the reader, it considers their background, age, intelligence, interests and reading ability. The purpose could be for information or entertainment. It also provides the Flesch-Kincaid readability formula to analyze text and determine what grade level could understand it.