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But actually leading readers through a how-to lesson could cross the line between advocacy and incitement and makes it easier for school officials to argue students are disrupting school . The lesson could culminate in a Favorite Poem reading , where students read or recite each one poem from their anthologies , speaking briefly to the class about why they like or chose the poem . Moreover , while a single mathematics lesson could combine time spent reviewing and introducing and practicing new content , there were a number of lessons that were entirely devoted to just one of those purposes . From her comments , I saw how much better the lesson could become . If the teacher chooses to extend the lesson by assigning additional case studies to individual students or small groups of students , the lesson could last for a couple of weeks .