The group's principal activity is to develop, publish and distribute proprietary instructional and assessment products to elementary and secondary schools, colleges and universities throughout the United States. The group's operations are carried out through two segments: assessment and instructional. The assessment segment designs, develops and evaluates assessment needs for schools, school districts and test and textbook publishers. The instructional segment designs, publishes and distributes 'consumable' student workbooks for grades k-6 and creates and publishes books, pamphlets and test preparation materials for teachers, students and parents.