When teaching pre-service teachers, teacher education systems want students to graduate with the ability to create a lesson plan that reaches a diverse population. The goal is to create learning opportunities for all students, which begins in the lesson planning process. As the search began for a format that pre-service teachers could use to differentiate their lessons, Dr. Herrelko found that in-service teachers learn to differentiate from their years as a teacher. Learning about the three tier Response to Intervention (RTI), the research began by having in-service teachers during a summer institute for professional development create lesson plans using the tiering system. During this process, the in-service teachers discovered that this system
