Section 7-502 - Intervals between appraisals; performance ratings(a) An employee subject to this subtitle shall receive the following written performance appraisals at 6-month intervals based on the employee's entry-on-duty date: (1) an informal mid-year performance appraisal; and(2) an end-of-year performance appraisal with an overall performance rating in accordance with § 7-503 of this subtitle.(b) An employee's performance may be rated on a performance appraisal as follows: