Of course some genres that are often taught in GWSI classes may bring students into contact with certain activity systems where issues of public policy are negotiated (writing a letter to the editor or to a legislator, for example). So also GWSI courses-particularly those with a writing across the curriculum emphasis-sometimes expose students to some genres of some disciplines. However, because the teaching and the writing are carried on separately from the activity systems, students are only peripherally involved in the intellectual, cultural, and political activity systems these genres help to mediate. By contrast, in courses designed to teach activities other than composition, students have more opportunity to learn who the participants in an activity system are, what they do, and how and why they do it-and thus what, how, and why they write the ways they do. In these "content" courses, students can learn to write in those ways eventually, or perhaps make an informed decision to resist those ways of writing and acting.