The document discusses principles for creating effective graphics to support written documents. It explains that graphics can catch a reader's attention, communicate difficult information clearly, and convey information to diverse audiences. Some key principles covered include that graphics should serve a clear purpose, present a manageable amount of information simply and clearly labeled, and be integrated properly in the text by introducing, explaining, and making the graphic visible. The document also provides guidance on using color effectively in graphics through contrast, emphasis, and established patterns.