In the spirit of models of argument starting with inquiry, this book starts with a question: What might it mean to teach argument in ways that open up spaces for change—changes of mind, changes of practice and policy, changes in ways of talking and relating? The author explores teaching argument in ways that take into account the complexities and pluralities young people face as they attempt to enact local and global citizenship with others who may reasonably disagree. The focus is foremost on social action—the hard, hopeful work of finding productive ways forward in contexts where people need to work together across difference to get something worthwhile done.