Form

Whilst learning the fundamental movements, a student is introduced to form.
Form serves to challenge the student.
The movement principles and habits must now be employed in a significantly more diverse manner.
Variety, combinations, permutations and stepping all require the student to extend their range of skill.

Form also has the added difficulty of being martial in nature.
Not only must the pattern be accurate in appearance, it must also contain internal strength.

Long-term, the student must possess the knowledge of how to apply the form in combat.