Like previous installments in the Radiant Mythology series, it has been shown that the player character will be capable of changing job classes by talking with this game's Guild Leader. Some job classes have special requirements in order for them to be unlocked, and players will have to expend grade points in order to transform into them. Source: Wikipedia, "http://en.wikipedia.org/wiki/Tales_of_the_World:_Radiant_Mythology_3," available under the CC-BY-SA License.