We employ an 8 level kyu belt ranking system before black belt. The requirements for each belt can be found under the "ICMA Students" tab.
The ranking system used at our school is: (scroll down for all levels)
Hachi Kyu
8th Kyu - White Belt
Shichi Kyu
7th Kyu - Yellow Belt
Roku Kyu
6th Kyu - Blue Belt
Go Kyu
5th Kyu - Green Belt
Yon Kyu
4th Kyu - Brown Belt
San Kyu
3rd Kyu - Brown Belt w/1 Black stripe
Ni Kyu
2nd Kyu - Brown Belt w/2 Black Stripes
Ik Kyu
1st Kyu - Brown Belt w/3 Black Stripes
Sho Dan
1st Dan - Black Belt