ACSI exists to strengthen Christian schools and equip Christian educators worldwide as they prepare students academically and inspire them to become devoted followers of Jesus Christ.ACSI is the parent company to Purposeful Design's Mathematics (K-8), Spelling Plus(1-6), and various science (1-9) programs. The math program offers a student textbook and teacher's edition for each grade. The spelling program offers student textbook and teacher's edition for each grade. The science program offers a textbook, lab manual, and teacher's edition for each grade.