International audienceTeachers in France tend to use complex reading materials as supplements for instruction. The present research explored the relationship between such materials, teachers’ instructional choices, and students' reading comprehension, focusing on disadvantaged schools. We combined detailed analyses of two books taught to first grade students with classroom observations and assessments of students’ comprehension. Although the two books appear simple, they include a number of aspects that complicate their comprehension by children. The teacher dedicated a lot of instructional time to the books and used a wide variety of approaches, including prediction and comprehension discussions, to support children’s understanding of the ...