How many broad categories are there in IUCN?

Related questions

1. What is the most endangered species on the planet?
2. Which is worse endangered or threatened?
3. What are the different levels of endangerment?
4. What is the purpose of IUCN Red List?
5. What is WWF P?
6. What are the levels of conservation status?

Tags

1. #geographic
2. #groups
3. #distribution
4. #criteria
5. #categories
6. #fragmentation
7. #classified
8. #specified
9. #population
10. #through
11. #degree
12. #decline
13. #species