The document discusses different types of cases that can be used in persuasion. It describes the three main case alternatives for the affirmative ("pro") side: problem-solution, advantages, and residues. Problem-solution argues there is a problem with the status quo. Advantages states there is something better than the status quo. Residues say that all alternatives but one are unacceptable. It also outlines the three case alternatives for the negative ("con") side: straight refutation, defense of the status quo with minor repairs, and counterproposal.