Toulmin Model of Argument
According to Discovering the World through Debate, the Toulmin model of argument is "A model of argument developed by philosopher Stephen Toulmin. The basic model includes evidence, warrant, claim, and reservation" (250).
Trapp, Robert, et al. Discovering the World through Debate: A Practical Guide to Educational Debate for Debaters, Coaches, and Judges. Third Edition. New York: IDEA Press Books, 2005.