Write an outline when you begin work on your research paper. The information that is most relevant goes in the paper; information and graphics that supplement your paper are saved for the appendix. For example, if you are writing a paper about an old science experiment, details of the type of equipment used at the time would belong in an appendix.
Tables, charts and graphic information are often included in an appendix so they don't clutter the body of the paper. Readers who are interested in examining the visual data can easily find it in an appendix. An appendix may be just a chart, but format it the same as you do the rest of your paper. For example, the chart should fit in one-inch margins like the rest of the paper.
The format of your appendix depends on what your professor wants, so always check the formatting instructions in the style manual your professor wants you to use. For example, if your professor prefers American Psychological Association, or APA style, include your appendixes after the reference page. Type them in Times New Roman 12 point font with one-inch margins.