Large chunks of information can ruin the flow of an otherwise great document. Too much information can distract the reader from the overall point of your document, or cause them to lose interest altogether. Rather than overload your readers with data, definitions, and graphs use appendices to enhance to make your document simpler and more coherent.
While the usefulness of the appendix as an organ is debatable, the use of appendices in writing is not. In fact, appendices are practically standard for long, technical documents. Appendices should not be used for superfluous information, but for information that is important to the text, but may not pertain to all readers. An appendix should be able to stand on its own, without reference to the main body of text. Appendices should be numbered with Arabic numerals (e.g. 1, 2, 3…). The title of the appendix should contain the appendix number, followed by a period, one space, then a concise title with no closing punctuation.