Across
- 1. people taking part in an activity
- 4. models used to test a design
- 5. give attention to something
- 6. very different form each other
- 8. a stage of development
- 9. made changes according to a plan
- 10. focused on a particular person or group
- 12. a detailed examination of a process or situation over time
Down
- 2. discovered
- 3. people between 13 and 19 years old
- 7. new and better
- 11. changed to make corrections and improvements