Like general education teachers, teachers with special education degrees grade assignments, homework, and tests for their special education students. Though special education students must have their progress monitored under the policies of most school districts and certain laws, the nature of the grading and assessment can be different than the grading and assessments completed for general education students. When grading special education students, as well as advancing such students, special education teachers often take into account the nature of the disabilities or special needs of the student. Many special education teachers also employ assessment results and a student's IEP as guides when assigning grades. Some students—primarily the severely disabled—are not graded at all in the traditional sense because their educational experience is not quantifiable in the same way. Such students have their progress assessed in other ways by teachers, with the input of other professionals. Accommodations should not affect how a student's work is assessed, however. Like other educators, special education teachers use repeated measures of student performance in order to determine the effectiveness of instruction. They can then make needed changes to their teaching if they find their students are not responding as they would like.