Toulmin Model
The following links provide information and explanation:
"Toulmin's Argument Model."
http://changingminds.org/disciplines/argument/making_argument/toulmin.htm
"Toulmin Model of Argument: Powerpoint"
http://www.powershow.com/view/41a56-ZWRjN/TOULMIN_MODEL_OF_ARGUMENTATION_flash_ppt_presentation