The Saiya-Jin society is divided into three classes. These are all based on strength and future potential. A common third class soldier isn't worth much to the irst class elite. A Saiya-Jin's potential is measured at birth, and from that he or she is divided into one of these classes. A Saiya-Jin can move out of it's class by becoming much stronger than the average strength level. So far, there are only two cases that have made it from the third into the first class: Bardock and his son Kakkarotto.