In Chapter 4, Using Computer Supported Argument Visualization to Teach Legal Argumentation, Chad Carr focuses on law, which of all fields, arguably places greatest demands on its students to develop argumentation expertise. Carr reports research that analyses the role of the QuestMap CSAV tool in supporting the collaborative learning of legal argumentation skills, compared to a control group of students using conventional resources. Like Kanselaar, et al.’s work (Chapter 3), he concludes that in learning contexts, the diagrammatic representation may not always play the role expected. He shares insights gained while conducting a sixteen-week study at a leading ABA accredited law school.