The conclusion serves two main purposes: 1) to signal to the audience that the speech is ending and 2) to reinforce the central idea of the speech. Some ways to signal the ending include using phrases like "in conclusion" and changing the tone, pacing, and rhythm of the speech. The central idea can be reinforced by summarizing the main points, using a relevant quotation, or making a dramatic concluding statement that may refer back to the introduction. When preparing the conclusion, speakers should consider possible concluding materials while researching, aim to end strongly with emotional appeal or drama, and keep the conclusion brief at around 10% of the total speech length.