22 Pa. Code § 155.16
(c) Two priority considerations, however, in the order stated here, shall have precedent value in the final establishment of the academic offerings available subsequent to retrenchment;
(d) The relative size of departments and enrollments shall be considered, and every effort shall be made to maintain the size of departments at a level that will preserve the integrity of academic programs and sub-specialities. In general, departments with ten or more positions are best able to reorganize their resources to maintain academic programs after a reduction in the number of their positions, and, therefore, they should be reduced more readily than smaller departments. Departments with four or fewer positions should be reduced with caution if their programs are to be maintained.
(f) An entire organizational unit may be dropped by the college if any of the following conditions exist: