SUBJECT
Programmed instruction
Study and teaching (Secondary)
English language
4
Aids and devices
2
Composition and exercises
2
Mathematics
2
Teaching
2
Academic achievement
1
Achievement tests
1
Chemistry
1
Dimensional analysus
1
Handbook, manuals, etc
1
High school students
1
Mathematical ability
1
Noun
1
Social sciences
1
Teaching machines
1
Testing
1
Writing
1