The introduction introduces everyone to your topic. The Body is Where all of the good stuff is and supports the information stated in the introduction. Finally, the conclusion wraps up what you talked about in a way that the reader feels a sense of closure. It's a way of saying "The End" by using much more interesting wording than "The End".
I know I could really run with the idea of "The Sandwich", and I'm going to play with it for a while. In the meantime here's a poster to go along with this lesson idea.
