Classification of Poomsae Patterns According to WTF:
http://www.wtf.org/about_tkd/poomsae_patterns.htm

Name of Poomsae Number of patterns Number of patterns Lines of Poomsae Level of Training
  TAEGUK 1ST Jang
2ND Jang
3RD Jang
4TH Jang
5TH Jang
6TH Jang
7TH Jang
8TH Jang
18
18
20
20
20
19
25
27
Keup
& Ist Dan (Poom)
  KORYO Single pattern 30 2nd Dan(Poom)
  KUMGANG Single pattern 27 3rd Dan (Poom)
  TAEBACK Single pattern 26 4th Dan
  PYONGWON Single pattern 25 5th Dan
  SHIPJIN Single pattern 31 6th Dan
  JITAE Single pattern 28 4th Dan
  CHUNKWON Single pattern 27 7th Dan
  HANSOO Single pattern 27 8th Dan
  ILYEO Single pattern 24 9th Dan