Civil Service Personnel Law 34

34. With respect to the matter of allowing prior increment the relevant Services Personnel Organization shall propose and submit to the Civil Services Board for the gazetted officers and to the relevant Ministry and Head of Services Personnel Organization for the services personnel lower  than gazetted officers; and carry out those by obtaining the approval after scrutinizing case by case based upon the following facts:
(a) being the matter which is suitable to raise and fix the initial pay when a person acquired extraordinary qualification and experiences exceeding the ordinarily necessary qualification is firstly appointed as a services personnel;
(b) being the matter which deserves to award to a services personnel for performing duty outstandingly at the present post;
(c) being the matter which is suitable to grant prior increment to a services personnel due to any other adequate special cause.