Choose which logical fallacies you want to teach. At minimum, you should address the following: Ad Hominem Argument; Faulty Analogy; Begging the Question; Equivocation; Questionable Authority; Hand Waving; Hasty Generalization; Appeal to Ignorance; Slippery Slope; Red Herring; Straw Man; Post Hoc, Ergo Propter Hoc; and Argumentum Verbosium.
Assign reading that describes and explains each logical fallacy. Most textbooks for introductory philosophy courses include a chapter or section on the logical fallacies. If you are teaching a different course in the liberal arts, you can create your own handout.
Design a multimedia presentation to teach the logical fallacies. Use PowerPoint or Prezi. In your presentation, make sure to include both definitions and examples of the fallacies. Employ a multimedia approach for showing examples, inserting case studies from videos, advertisements and articles or books.
Devote a class session to the logical fallacies. Consider integrating "Peer Instruction," a teaching technique developed by physicist Eric Mazur, into this class session. "Using Peer Instruction to Teach Philosophy, Logic and Critical Thinking" explains this technique and its potential applications. For example, show a few slides that define select fallacies. Next, show an excerpt from a video in which the speaker employs a logical fallacy. Ask a multiple-choice quiz question to test the students' knowledge. If most students answer correctly, continue with the class session. If most students provide the wrong answer, review your slides and the video excerpt again. If the students present a mixture of answers, have students discuss their answer with their neighbors and try to persuade them that their answer is correct. Ask the multiple-choice question again.
Test your students. Use a combination of definition and identification questions. In one section of the test, ask students to define some of the logical fallacies. In another part of the test, provide examples of logical fallacies and require students to identify the fallacy in each example.