A pattern set is a chronological group of patterns that a martial art organization has established as the core patterns that must be performed by students to progressing through the ranking system.
The patterns, their order, and which ones are required for each rank may be different among different organizations within the same martial arts system. For example, International Taekwondo Federation (ITF) forms are different from World Taekwondo (WT) forms. Sometimes even the movements within a pattern may be different among the different schools or organizations that use the pattern.
Many videos can be found on the internet that describes and show how to perform the patterns of most martial art styles. For videos on different taekwondo pattern sets, check out: http://www.natkd.com/tkd_forms.htm
ITF pattern set. The pattern set used by the International Taekwondo Federation.
WT pattern set. The pattern set used by the WorldTaekwondo organization.
ATA pattern set. The pattern set used by the Amerian Taekwondo Association.
TA pattern set. The pattern set used by the Taekwondo America organization.
No arms pattern set. A pattern set for students with no arms or without the use of the arms,
Ki-bon. A beginning pattern used by some taekwondo schools and organizations.