(1) Teachers shall be assigned at the levels and in the subjects for which their certificates are endorsed. Exceptions are:

(a) individuals serving in internship positions approved by the Board of Public Education;

(b) teachers assigned in grade 5 or 6 in the departmentalized classroom or middle school, who hold a 5-12 secondary certificate, must be endorsed in the subjects they are teaching. A 5-12 certificate will not cover a grade 5 or 6 assignment in a self-contained classroom;

(c) clarifications of teaching assignments in grades 5 through 12 departmentalized settings are published in Appendix A of the "Montana School Accreditation Standards and Procedures Manual" adopted November 2000.

(2) Certification at the elementary level entitles the holder to teach in grades K through 8.

(3) No teacher shall have more than 28 hours of assigned student responsibility per week except for one-, two-, and three-teacher schools.