This PowerPoint is an excellent introduction to debate for middle school. As middle school teachers we know that adolescents love to debate, but rarely do we teach them the art of debate until later high school years. My students have loved doing debate, and I love it because they learn how to better communicate with one another, disagree respectfully, back up their own statements with evidence, AND they really enjoy debating.
This download provides a Power Point version and a PDF version.
If you're interested in more debate resources, check out my Debate Bundle.