Instead of publishing expensive textbooks in the local language (Afan Oromia), the schools use inexpensive, computer-generated instruction cards that are shared among all students in the school. The cards are laminated, thus extending their life-use to about three years. Children progress through the cards at their own pace after satisfying the teacher that they have mastered the material. Children study in groups defined by learning level (not age), and help each other learn under the supervision of a teacher. Rather than buying new textbooks for children each year, the laminated cards are replaced every three to four years.