Preference Selection

Special Instruction for Fall Semester 2022

Due to the great demand for Chemistry courses, we will be offering Preference Selection later than other departments.

Preference Selection system will be conducted from Mon. August 15 to Mon. August 22 at 5 pm, 2022 for all cohorts taking Chemistry courses. Students registered for the following courses will need to rank top three section choices through the correlating course link.

A direct email will be sent from ( or the DUS Academic Support team to all registered students at the beginning of August with further instructions and specifc links.

Chemistry Courses utilizing August 2022 Preference Selection:

  • CHEM 134L
  • CHEM 161
  • CHEM 163
  • CHEM 165
  • CHEM 174
  • CHEM 220
  • CHEM 222L
  • CHEM 332
  • CHEM 330L

Students will then be able to rank specific days and times for discussion and laboratory sections, and a seat will be determined via Preference Selection (as it was in previous years). Your choice in Preference Selection should then be pushed to your Spring schedule automatically after these steps occur. 

Please note, students who would like to change or make adjustments to course schedule or sections will need to do so during the Add/Drop period which begins August 29, 2022 and closes September 7, 2022.

General Information

The Preference Selection tool is an online system for students to rank their preferences for the timing of their discussion section for lecture courses and/or the time of their laboratory section for laboratory classes. Seats are distributed to students through a lottery and are placed directly on the student’s schedule. 

Many chemistry courses and labs use Preference Selection. To see if a course uses Preference Selection, look at the course description in Yale Course Search (YCS). Information and links for Preference Selection sites are available directly in online course selection (OCS). Students can also view Preference Selection information, including open and close days and times, on the University Registrar’s Office Preference Selection page

When a student adds any course with a discussion/lab section that has online sign-up, a window will open to inform them when the section sign-up will become available. If this course uses Preference Selection, the pop-up window will also include the dates it will start and end and a link to the Preference Selection site. Students can also access the site from the course description in YCS or OCS. 

If the Preference Selection site is open when one adds the course to their schedule worksheet, they can click on the link and go directly into the site to rank their selections. Specific instructions for doing this are within the site itself. Please email with any further questions or concerns. 

The assigned discussion/lab section will be uploaded to the student’s worksheet, when the Preference Selection period ends. Once general discussion/lab section sign-up opens to all students, they can change to a different section, be waitlisted, or drop the course completely from their worksheet.