In CLSS, an Instance is a container that holds multiple terms for a group of Scheduling Units (SU).
Each Instance can include multiple terms including Archived terms (e.g., Fall 2025, Spring 2026).
The structure in CLSS is: Instance → Scheduling Unit → Course Sections (CRNs).
Instances contain Scheduling Units and Scheduling Units contain course sections.
Permissions and rules are first applied at the Instance level, then can be fine-tuned at the School- or College-level and further refined at the Scheduling Unit level.
The purple banner at the top of the CLSS page will indicate which Instance your Scheduling Unit is in.
After logging in, you will be on the Instances page of CLSS.
Key messages, including important scheduling deadlines and helpful links, are displayed in the purple banner.
Under your SU's Instance, select the Term you wish to work in.
This will take you to the list of Scheduling Units.
Doubleclick your Scheduling Unit ID to open your Scheduling Unit's homescreen.
Your Scheduling Unit's Homescreen
The top navigation bar shows the current term and Scheduling Unit you are working in.
Click the term to return to the list of SUs.
Click "CourseLeaf/CLSS" to return to the CLSS homepage.
The total number of courses scheduled and the number of sections are displayed as well as the Phase and Mode your SU is in.
Use the up and down arrows to expand and display all sections (active, inactive, cancelled).
To view all courses in your SU's catalog, check the "Show courses with no sections" box.
Doubleclick a section to view or edit it.
Crossed out sections indicate inactive or cancelled sections. Best practice is to re-activate an inactive section before adding a new one. You cannot reactivate a cancelled section.
To add a new section, click the green plus sign to the right of the course.
Use View By filters to review your Scheduling Unit's sections:
By Course – Default view.
By Instructor – Identify potential instructor double-booking within your Scheduling Unit and Undergraduate–Graduate level cross-lists.
By Day and Time – Review the schedule by day of the week and identify over- or under-used Standard time slots.
By Room – Review departmental room usage or identify sections requesting General Purpose spaces.
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