Mrs. Blevins used the Concept Mastery Diagram to teach her fifth grade inclusion classes about the five text structures of compare/contrast, description, chronological order, problem/solution, and cause/effect. During separate class periods, she would introduce one of the five structures using the Concept Mastery Diagram, guiding students through the co-construction process. I observed her on two different occasions during this period. some of the structures were difficult for the students to settle on the always, sometimes, and never present categories because they seemed to find overlap during their discussion; however this resulted in a deeper analysis of each structure and, from my perspective, a greater understanding of each one. They learned that there can be overlap between the differing concepts and openly discussed these cases.