I am an assistant instructor in my school, so do not ultimately decide whom should test for black belt; however, I participate in Black Belt testings and have an opinion on this subject. Last year our school promoted a student (who had handicap) to Shodan. Yes, she too made and makes mistakes, but she is giving her 100% everyday and always tries to improve. She went through the very exhausting 4 hour test and the written exam just as everyone else and was not given any special priviledges. I wish everyone had a heart like this student. Can she go out and win a tournament, no probably not, but that isn't why she joined. Can she defend herself if need be. Yes. Remember, belts used to only be white and got darker with experience until colorized by the judo system. Every student has a right to earn a rank and every student should be judged on individual performance and attitude. I have unfortunately seen black belts with great technique but with poor personal skills who do not represent their instructor and dojo the way a BB should.