Audio-visual aids Study and teaching 37 Education 22 Autistic children 15 Children with disabilities 15 English language 14 Self-instruction 13 Teaching 9 Training of 9 Employees 7 Foreign speakers 7 Audio-visual education 6 Activity programs 5 English 5 Study and teaching (Secondary) 5 Arabic language 4 Chinese language 4 German language 4 Interactive multimedia 4 Textbooks for foreign speakers 4 Audio-visual instruction 3 English speakers 3 French language 3 Japanese language 3 Methodology 3 Science 3 Second language acquisition 3 Special education 3 Special education teachers 3 Storytelling 3