This document discusses division and classification. Division breaks things down into subunits, like dividing New York into sections for natives, commuters, and transplants. Classification places items into categories, like putting animals into the mammal category. When planning an essay, division and classification can be used to determine categories and organize the essay. The thesis should present the categories that will be used, such as dividing stereo shoppers into those focused on looks, wattage, price, or quality.