According to the value of the Z-score, all members of a particular rank in a particular mustering are divided into promotion groups, from one to six, Group 1 being the highest.
Ngokwexabiso lenqaku elinguZ onke amalungu asisigxina kweso sigxina ahlulwe ngokweqela lonyuselo ukusuka kwenye ukuya kweyesithandathu elokuqala ilelona liphezulu.