Delivery is the most important part of a speech. The way you speak, your interaction with the audience, your posture, and your eye contact all affect your overall presentation. In short, a confident, controlled speaker will have a positive impact on an audience, while a speaker who fumbles with note cards, speaks in a shaky voice, or seems disorganized will lose credibility. To make sure that your listeners see you as a credible, reliable source of information, follow these guidelines: