The document discusses six supporting devices that can be used when presenting ideas: examples, explanations, statistics, testimony, comparisons/contrasts, and visual aids. It provides details on how to effectively employ each device, such as using brief or detailed examples, different types of explanations, ways to convey statistics, incorporating expert testimony, highlighting similarities and differences, and tips for using visual aids. The document also notes that combining multiple supporting devices is more effective than relying on just one, and discusses primary sources for gathering supporting materials like written documents and interviews.