How can the inclusive education of students with and without intellectual disabilities succeed in primary schools? This task poses a significant challenge, particularly for primary school teachers, but also for special educators. The author conveys the fundamentals of inclusive education and demonstrates how these can be applied in everyday classroom settings. Various methods for lesson planning and design, such as didactic mapping, internal and external differentiation, as well as open teaching, are clearly explained. Numerous working materials, checklists, and practical examples provide assurance in dealing with students with and without intellectual disabilities in inclusive classrooms.