Class and Classroom Scheduling

The Office of the University Registrar works with school and departmental staff in the following schools to create and schedule courses and classrooms each term:  Graduate School, Nicholas School of the Environment, Pratt School of Engineering, Sanford School of Public Policy, and Trinity College of Arts & Sciences. 

Departments use CourseLeaf Section Scheduler (CLSS, pronounced “class”) to submit scheduling requests to the Office of the University Registrar (OUR). The OUR then updates the data in DukeHub. CLSS tracks scheduling requests and checks for compliance with the Course Scheduling Policy.

CLSS URL (NetID and password required)

CLSS Access

To gain access to CLSS, submit the CLSS Access Request form.

CLSS Training

Training Video

Training Guides

Helpful Tips and Important Reminders:
  • All additions, deletions, and revisions to your schedule must be submitted in CLSS.
  • Schedules must be validated prior to submission.
  • Classes are set up on the schedule according to how the courses are set up in the course catalog. This includes (but is not limited to): class permissions, prerequisites, REG codes, credits, and permanent crosslists.
  • CLSS pulls permanently crosslisted courses from the catalog, which are required to be scheduled. However, there is also the option to add one-time crosslists. IMPORTANT: Communicate with the department that you intend to crosslist courses with prior to adding the course to your schedule.
  • If you want to secure a room in the Link or ICC, please request the corresponding room characteristic and provide explanation for need in the Comments to Registrar section.

Have questions? Email

Undergraduate and Graduate Course Schedule, Courses Numbered 1-699
(Revised June 2020, Effective Fall 2020)

Period 50-Minute Classes 75-Minute Classes 150-Minute Classes
1 8:30 - 9:20 8:30 - 9:45 8:30 - 11:00
2 10:15 - 11:05 10:15 - 11:30 10:15 - 12:45
3 12:00 - 12:50 12:00 - 1:15 12:00 - 2:30
4 1:45 - 2:35 1:45 - 3:00 1:45 - 4:15
5 3:30 - 4:20 3:30 - 4:45 3:30 - 6:00
6 5:15 - 6:05 5:15 - 6:30 5:15 - 7:45
7 7:00 - 7:50 7:00 - 8:15 7:00 - 9:30
Online Meeting Recommendations/Requirements:1
  • When scheduling classes, schedulers should remember to apply the most accurate format to the class

    • Online: the class meets online/remotely; no in-person, face-to-face meetings
    • On Campus/Online (Hybrid): the class meets in person and there are online/remote meetings
    • In-Person: the class meets only in person
  • All classes must be available in an online format or have an online counterpart to accommodate students who may not be able to attend class physically (due to travel restrictions, reduced class sizes due to social distancing guidelines, etc.).
    • We expect most classes to be listed as hybrid or online.
    • Hybrid classes must have an online-only counterpart.
    • Online and hybrid classes may have an in-person counterpart, but one is not required.
  • Classes are not required to have an in-person component. In particular, some faculty may not be comfortable teaching in-person. We urge faculty and DUSs/DGSs to think about team-teaching arrangements and other collaborations that may facilitate hybrid and online formats
  • To comply with social distancing guidelines, all large enrollment classes (enrollments of 60 or more) must2
    • transition the large class to online, or
    • create smaller sections of the class, or
    • develop asynchronous online “lecture-style” modules that students review in advance, and then create smaller “discussion” or “group chat” sections that meet each week in-person, online, or a combination.
  • Classes should not require a student, who is participating online, to attend a synchronous session; synchronous defined here as “at the assigned meeting time the instructor is engaging with the class online or in-person”. Online sessions should be recorded and made available for a student to review at a time convenient for the time zone in which they are located.
    • This policy does not preclude requiring students to participate in some sort of interactive component involving a real-time discussion or conversation, where students -- who cannot participate during normal class meeting times -- can engage with each other, with instructors, in a tutorial session, in a small online discussion group, or other forum.
    • To accommodate students in different time zones, faculty may opt to schedule online discussion groups prior to scheduling period 1 or after scheduling period 7.
  • For faculty who choose to schedule classes on the weekends, the class scheduling periods still apply.3​​​​​​​
Meeting Start and End Times:
  • All classes, regardless of length, must align with the listed start and end times. Specifically, while classes may end before the listed end time, no class may end later than the noted end time. The meeting start times and end times were chosen to allow for an expanded set of class meeting spaces, for greater movement to and from classes, and for cleaning and sanitizing.
Meeting Patterns:
  • In-person class meetings are limited to twice per week (excluding labs). Classes that meet more than twice per week must transition additional meetings (i.e., those beyond two) to an online format. If we are able to relax this constraint, we will let schedulers know of the greater flexibility.
Distributional Constraints:4
  • Departments may schedule UP TO 50% of all of their classes below the 700 level during periods 2-4 ("prime time").
Special Circumstances:
  • Departments offering six or fewer courses per semester at the 1-699 level do not have to meet this or the other percentage constraints, but they are expected to provide a reasonable spread of courses over the day and week. If departments offering ten or fewer courses at the 1-699 level in a given semester schedule at least one of those courses in the first period, they are permitted to schedule up to 65% (instead of up to 50%) of their classes in periods 2-4 ("prime time").
  • AT LEAST 40% of all departmental course offerings below the 700 level must meet in some combination of two or three (or more) days per week or for two days per week in the MW, WF, or MF pattern..
  • Departments can offer any combination of three-day classes, two-day classes in the MW, WF or MF pattern in order to meet this constraint. The only stipulation is that if a department offers any MW or WF classes it must offer an equal number of the opposite pattern.
  • Departments may schedule UP TO 50% of their classes below the 700 level in the TTH meeting pattern.
Further Clarifications:
  • There are no percentage constraints on 700-level and above graduate classes.
  • Regarding the constraint about no more than 50% of courses in "prime time", the course validation program automatically accommodates an odd number of course offerings by giving the benefit to the department.
  • For purposes of the percentage constraints, cross-listed courses count only for the department owning the course.
  • No TBAs for day and time may be submitted, with the exception of independent studies and. internships.

Departments who wish to appeal any aspect of their course validation may do so via email to the Office of the University Registrar.


1 We recognize the significant effort involved in rescheduling your departments's classes in terms of length of class time, meeting times (start and end times, number per week), mix of face-to-face and online, etc. We are trying our best not to constrain you more with distributional requirements. However, because necessary social distancing in the classrooms reduces our space inventory, it is more important than ever that we schedule classes throughout all times of the day and across days of the week.  We very much appreciate your help.

2We believe we will be able to accommodate space for classes with enrollments below 60. That said, the fewest spaces we have on campus are larger classrooms and lecture halls. Thus, if you are willing and able to create and staff two sections of a larger class, with smaller enrollments for each section, that will make it easier for assigning space.

3We are working through now an option for 2-week “immersion” periods (in December, January and May) during which a student who may have taken a course online might complete a in-person component of the course that is not possible to deliver virtually, e.g., certain labs or other physical activity such as a dance course. We hope to have more details on this option soon.

4We recognize the significant effort involved in rescheduling your department’s classes in terms of length of class time, meeting times (start and end times, number per week), mix of in-person and online, etc. We are trying our best not to constrain you more with distributional requirements. However, because necessary social distancing in the classrooms reduces our space inventory, it is more important than ever that we schedule classes throughout all times of the day and across days of the week. We very much appreciate your help

Revised June 4, 2020

Effective Fall 2010 the Higher Education Opportunity Act of 2008 (HEOA) requires all institutions receiving federal financial aid to "publish," in time for registration, a list of all required and recommended books and other course materials for all classes offered at the institution. This includes all schools—undergraduate, graduate and professional. The items we must display are:

  • Book title, including edition
  • Book author
  • ISBN number
  • Retail price

This is an effort to make more transparent the cost of education, as indicated in the following statement from the HEOA:

PURPOSE AND INTENT—The purpose of this section is to ensure that students have access to affordable course materials by decreasing costs to students and enhancing transparency and disclosure with respect to the selection, purchase, sale, and use of course materials. It is the intent of this section to encourage all of the involved parties, including faculty, students, administrators, institutions of higher education, bookstores, distributors, and publishers, to work together to identify ways to decrease the cost of college textbooks and supplemental materials for students while supporting the academic freedom of faculty members to select high quality course materials for students.