The university distinguishes carefully between lower level and upper level work. Upper division courses are indicated by numbers from 300x to 499x. Upper division courses provide students with more advanced and specialized instruction than is true of lower division (1000/2000 level) courses. A senior may not elect a freshman course for credit unless that course is required for graduation. Before Registering in 4000 level courses, students must have completed 30 credit hours toward graduation or have the approval of the chair of the department offering the courses. Students still needing to complete required remediation may not register for 3000/4000 courses.