Choi Hong Hi
Patterns ("tul") are performed in accordance with "The Encyclopedia of Taekwon-Do" in 15 volumes written by General Choi Hong Hi, the latest edition being from 1999 (later editions have been published, but the 1999 editions were the last General Choi Hong Hi was directly involved with). This comprehensive work contains 15 volumes with volumes 8 to 15 dedicated to the 24 patterns and containing descriptions of the pattern movements as well as pictures showing possible applications of some of the movements. There is also the book entitled "The Korean Art of Self Defense" (the 1999 edition, the latest used by ITF under Chang Ung), also known as the Condensed Encyclopedia, written by General Choi Hong Hi. This is a single condensed encyclopedia of approximately 770 pages with a section dedicated to the 24 original patterns.