George is making a presentation on the proposed refuse removal program for the community. It is a complicated presentation because it is a drastic change from the current program and affects many departments within the town. He wants to make sure the audience understands his intended message, so he previews his main ideas in the introduction, frequently summarizes the key ideas within the speech, and provides a visual outline to help listeners follow along. Through his efforts, George is enhancing the __________ of his message.