If students are going to make strong, effective arguments then we need to make as much space during class to teach them how to think through their claims and reasoning as we spend on how to write them. Here are some good links and documents that may help:
Chapter 1 of George Hillock's Jr's Teaching Argument Writing: 6-12: http://www.heinemann.com/shared/onlineresources/e01396/introandchapter1.pdf