Mathematics Study and teaching (Secondary) Study and teaching 96 Problems, exercises, etc 93 Statistics 93 Science 19 Study and teaching (Middle school) 14 Random walks (Mathematics) 12 Stochastic processes 12 Activity programs 11 Advanced placement programs (Education) 8 Education 8 Effective teaching 7 Study and teaching (Elementary) 7 Teaching 7 Computer-assisted instruction 6 Curriculum planning 5 Evaluation 5 Mathematics teachers 5 Study and teaching (Higher) 5 Aids and devices 4 Education, Secondary 4 Training of 4 African American civil rights workers 3 Educational technology 3 English language 3 High school teaching 3 Lesson planning 3 Mathematical ability 3 African American youth 2