Language classes in schools are organized by age or grade level, rather than by ability, so it is common to have a range of abilities in one classroom. In the primary grades, there are also age-related developmental variations in cognition. This study will demonstrate how these variations can be used to positive effect in the classroom. The teacher can use the same materials for all students, but have differing objectives or assessment criteria for individual students. In addition, by having the students collaborate with each other, the students' motivation is increased and their Japanese ability is improved.