(a) Appraisal period.(1) An appraisal program shall designate an official appraisal period for which a performance plan shall be prepared, during which performance shall be monitored, and for which a rating of record shall be prepared.
(2) Each program shall specify a single length of time as its appraisal period. The appraisal period generally shall be 12 months so that employees are provided a rating of record on an annual basis. A program's appraisal period may be longer when work assignments and responsibilities so warrant or performance management objectives can be achieved more effectively.