Rather than an act of domination, a good argument can be "an invitation to collaborate, to reason together and, perhaps, to find and inhabit common ground," writes Notre Dame English professor John Duffy. This issue will look at how teachers, in all subject areas, are helping students approach argument writing with a sense of inquiry—generating relevant theses or claims that are supported with clear reasoning and vetted evidence. Use the many tools and activities in this issue to help your students judge and deliver sound arguments.