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System Status: 

Preparing to Book (Undergraduates)

Check the topics below for important booking information for undergraduate students.

Note: Summer Session may have separate procedures; see the Summer Session website.

Important news

Log into WebReg to manage your Summer Session 2026 courses.

Log into TSS (sis.ucs.edu) to find available classes and to book your courses for Fall 2026. For details, see the how-to pages linked here, and TSS Student Info.

Booking appointment times

  • Check TSS for your first and second pass booking windows for the next quarter.  The date of when booking windows are viewable for the quarter can be found on the Booking and Registration calendar
  • You will be assigned a booking window based on the number of quarters and units you have completed.

Booking and fee payment holds

  • Go to Holds. Contact the office indicated to clear each hold.
  • TSS will not allow you to Book/ Drop/ Change unless all booking holds have been cleared.
  • The TritonPay Office can't process fee payments until all fee payment holds have been cleared.
  • If you requested a waiver of the Undergraduate Health Insurance premium, the waiver can't be applied to your account until all fee payment holds have been cleared.

Booking limitations

  • You are allowed to book in 11.5 units during the first pass and 19.5 units, including wait-listed courses, during the second pass up until the first day of instruction.
  • If you do not book during your first pass booking window, you must wait until your second pass booking window.
  • Starting the first day of instruction, you may book in up to 22 units, including wait-listed courses.
  • Starting on Monday of Week 1 of the quarter, you may request to book in more than 22 units via Triton Enrollment Authorization (TEA).
  • Submit a request through the Triton Enrollment Authorization (TEA) for classes that can't be booked or dropped using TSS.

Prerequisite requirements

  • Current enrollment in a prerequisite class will satisfy a prerequisite.
  • If you satisfied a prerequisite by taking a class at another college or university, contact the department offering the class to be authorized to book the course.
    Note: Transfer equivalencies may not have been entered into the system.
  • Some classes require departmental approval. To book in these classes, contact the department via the Virtual Advising Center (VAC).

Other restrictions on booking

  • TSS will also check for these restrictions:
    • Major
    • College
    • Class level
  • Refer to the far left column in the Schedule of Classes for codes indicating type of enrollment restrictions that apply to each class.
  • If the system blocks your enrollment in a class you are eligible for, contact the department via the Virtual Advising Center (VAC).

Department approval procedure

Wait lists

If the section you want is full, TSSwill offer you the option to book in another section of the class, or to wait-list the section that is full.

  • Wait-lists will only be available during second pass appointments.
  • You can wait-list no more than one section of a course.
  • You can't be booked in a class and wait-listed in a different section of the same class.
  • For detailed instructions, see How to Wait-List a Class.
  • You can be wait-listed and booked in no more than 19.5 units as of the second pass, and no more than 22 units once the quarter has begun.

Class confirmation

  • Be sure that all information is correct, including your grading option and units.
  • If a wait-listed course was added to your schedule, it will be included in your schedule on TSS.
Questions? Contact the Registrar's Office, email registrar@ucsd.edu or (858) 534-3150.