Study and teaching (Middle school) Study and teaching (Elementary) 33 Mathematics 23 Study and teaching (Secondary) 20 English language 14 Science 9 Social sciences 9 Composition and exercises 8 History 7 Activity programs 6 Language arts (Middle school) 6 Alice (Computer program language) 5 Computer animation 5 Computer programs 5 Computer-assisted instruction 5 Object-oriented programming (Computer science) 5 Study and teaching (Higher) 5 Three-dimensional display systems 4 Algebra 3 Calculus 3 Critical pedagogy 3 Geometry 3 Mathematical readiness 3 Study and teaching 3 Training of 3 Active learning 2 Aids and devices 2 Brain 2 Children's literature 2 Civics 2