This article examines the discursive practices evident in Whole-Class Text-Response Discussion (WCTRD) as a pervasive curriculum activity in secondary English classrooms in Australia. This site was selected as an important one in the social construction of adolescents as apprentice citizens capable of reasoning from text in culturally valued ways. Bernstein's model of pedagogic discourse provides a sociologically principled framework within which the construction of particular forms of argumentative reasoning can be examined, as these forms are regulated either through visible or invisible pedagogies. Halliday's model of social semiotics provides the linguistic tools for the examination of how institutionally privileged values and ways of reasoning are realized in the micro-semantic exchanges of two such whole-class text-response discussions; one regulated through a highly visible pedagogy and the other through a relatively invisible pedagogy.