How do you level up vault dwellers?

Related questions

1. How do you survive fallout shelter?
2. Does Mr Handy heal fallout shelter?
3. What is the fastest way to get caps in fallout shelter?
4. What is Mr handy in fallout shelter?
5. What happens when dwellers level up?
6. What happens if dwellers die on a quest?
7. How do you start over in fallout shelter?
8. What does the vault door do in fallout shelter?
9. How Long Can rooms be in fallout shelter?
10. What does Mr Handy do in fallout shelter?

Tags

1. #skills
2. #training
3. #level
4. #depending
5. #special
6. #varies
7. #dweller
8. #building
9. #working
10. #other
11. #their
12. #start
13. #dwellers
14. #train
15. #takes
16. #skill
17. #which
18. #together
19. #upgrade
20. #rooms