H-Pattern Kata is taught to white belts and introduces the concept of a kata.
Seisan Kata, in Isshinryu, is taught to yellow belts, although in other styles, it is taught at advanced levels.
Seiuchin Kata is taught to blue belts (8th kyu).
Wansu Kata is taught to blue belts, second degree (7th kyu).
Nai Hanchi Kata is taught to green belts (6th kyu).
Chinto Kata is taught to green belts, second degree (5th kyu).
Toko Mini Nokun Kata is the first bo kata, taught to purple belts (4th kyu).
Sanchin Kata is also taught to purple belts.
Kusan-Ku Kata is taught to brown belts, 1st degree (3rd kyu).
Kusan-Ku-sai Kata is taught to brown belts, 2nd degree (2nd kyu).
Sun-su Kata is taught to brown belts, 3rd degree (1st kyu).
Urashi Bo Kata is a shodan (black belt, 1st degree) kata.
I am starting work on an essay about the role of the senior student and one about leading warmups. Comments welcome on both.
More information relating to Isshinryu: the karate creed, code of Isshinryu, and Japanese vocabulary.