Actually, it is roleplaying. It's a quantifible way to tell if the Players are playing in alignment. And to have a basis of altering it based on actions.
Kai Lord, basically you get temptation and redemtion points based on the amount of good and evil stuff the character does. If one is higher then the other by your wisdom score or more you have shifted alignments by one step. All the points go away and the process starts again.