The idea of teaching writing through genres--rather than, say, through prescriptive forms, templates, and rhetorical modes--is intuitively appealing. Yet many teachers have questions, and they are absolutely right to ask them: What are genres? What is genre-based instruction? What do students write if they don't write essays? Isn't it easier to teach and learn five-paragraph essays? What's the role of language in genre teaching? And many more. These...