Instructors and Supervisors
In some countries the IBJJF allows athletes who have not achieved the rank of black belt yet to sign as instructors. Actually these athletes are officially considered supervisors.
Brown and purple belts can be supervisors, although in some countries only brown belts can have the rank. In case the supervisor is a purple belt, he can only grade students up to blue belt; in case the supervisor is a brown belt, he can only grade students up to purple belt.
This is a temporary measure that will only be applied in countries that do not have yet enough certified black belt instructors available for the development of the sport. Once there are enough black belts, the supervisor rank will no longer exist.