The document discusses keys to writing a successful classification or division paper. It should choose a limited topic and apply a single principle of classification or division. The classes or groups should not overlap and the classification should be reasonably complete, introducing subclasses as needed. Several examples are given of topics and the identifying principle, such as types of drivers classified by color of eyes or uses for leftovers divided according to use. Supermarket shoppers are divided into three groups based on how they shop.