Grades can not be changed without the consent, in writing, of the instructor who assigned the grade and then only under extreme conditions. Grades will not be changed later than one semester after the semester in which in the grade was assigned. Grades are not subject to change by reason of a revision of judgement on the instructor's part. Only "incompletes" may be revised by the instructor on the basis of a new examination or additional work undertaken or completed after submission of the grade of "I" grades. All grade changes must be approved by the dean of the respective college and the Vice President for Academic Affairs.