D.C. Mun. Regs. tit. 8-B, § 1137
1137.1 Competition within each title and grade/level specified in §1136.5 shall be resolved by an individual's standing within one (1) of the following employee categories:
(a) Category 1 - Permanent full-time salaried employees;
(b) Category 2 - Permanent part-time employees;
(c) Category 3 - Probationary employees;
(d) Category 4 - Temporary full-time employees;
(e) Category 5 - Temporary part-time employees; and
(f) Category 6 - Wages As Employed (WAE) employees hired on an intermittent basis.
1137.2 Category 1 employees shall have the highest priority for retention.
1137.3 Category 6 employees shall have the lowest priority for retention.
1137.4 Competition between employees within the same work unit, title, and grade/level and in the same employee category shall be determined by the following factors:
(a) Length of service; and
(b) Veterans preference pursuant to University enabling legislation.
1137.5 Length of service shall include all previous employment with the University and its predecessor institutions. Length of service shall also include time guaranteed by the provisions of the University's enabling legislation or the D.C. Comprehensive Merit Personnel Act.
1137.6 Any employee seeking credit for previous service time which may be guaranteed by enabling legislation or the D.C. Comprehensive Merit Personnel Act shall be required to provide official documentation.