(a) Only employees whose basic annual salary, exclusive of any longevity payment, is less than the job rate, who have been in their salary grade for the equivalent of 10 full payroll periods (100 workdays) during the preceding fiscal year and who have received a final performance rating of outstanding, excellent, good, or needs improvement, shall receive a performance advancement. The payment of initial performance advancements to employees who were advancement-eligible on April 1, 1980, by virture of having been in their salary grade for the equivalent of 10 full payroll periods (100 workdays) during fiscal year 1979-80, shall be payable retroactive to that payroll period the first day of which is nearest April 1, 1980. For employees who were not advancement-eligible on April 1, 1980, and for all employees for the remainder of the negotiated agreement, performance advancement payments shall be effective at the beginning of that payroll period the first day of which is nearest April first, or at the beginning of the earlier of two payroll periods, the first days of which are nearest but equally near April first.

(b) Advancement-eligible employees who receive a final rating of unsatisfactory will have the salary advancement withheld for one year. Advancement payments may not be withheld more than once while the employee is in a particular salary grade.

(c) In no case may an employee's salary exceed the job rate of the salary grade by virture of a performance advancement payment. However, that portion of the advancement which would bring the employee's salary up to the job rate shall be paid as an advancement.

(d) Part-time employees who are eligible for a performance advancement will be paid on a pro rata basis proportionate to the fractional equivalent of the time being worked.

(e) Special provisions for employees who have changed salary grades.