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Course and exam enrolment

You can enrol for courses and exams via uSis or your faculty's education administration office.

Take a look under your faculty or study programme tab for further information. If you have any questions, please contact your education administration office


Do you have a question about uSis? If so, please consult our FAQs or send a mail to the uSis web editors

Course and exam enrolment

If you want to take a certain subject and / or examination (including re-sits), you have to register via uSis in a classnumber. Mostly this classnumber refers to an EXAMINATION, but you are kindly asked to enroll as soon as you plan to follow a course. Then the coordinator can use the list of enrolled students as an indication of the number of students that can be expected in the group. Find the numbers you need by choosing your Bsc of Msc programme in the menu below or by the TAB that indicates the study programme. To change the study programme, fill in your choice on the upper right hand side of the screen.

The classnumbers for YEAR 2017-2018 are not yet all defined. In the link below (Classnumbers 17-18) we will show the numbers that are already available. The information will be updated as soon as more information is available.

Useful tips:

Classnumbers Bachelor Programmes 2017-2018


Astronomy - check the Exam Schedule on the Astronomy information page 

Bio-pharmaceutical Sciences -  year 1   /  year 2  /    year 3

Biology - the information is available via the E-guide (right hand side - check the 'usiscodelijst')

Computer Science (24-2-2018)

Computer Science and Biology (17-2-2017)

Computer Science and Economics (24-12-2018)

Mathematics (11-1-2018)

Molecular Science and Technology (30-8-2017)

Physics: - check the Exam Schedule on the Physics information page


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Classnumbers Master Programmes 2017-2018

Choose the programme you want to select a course from:
NOTE: If you want to select a bachelor course, check the Section “Bachelor Programmes”

Astronomy 2017-2018  - check the Astronomy Information pages

For now you can find the Astronomy-Physics classnumbers here

Bio-Pharmaceutical Sciences 2017-2018  (12-1-2018)
BPS - Research Projects (20-9-2017)

Biology - 2017-2018

the information is  available via the E-guide (right hand side - check 'Registration in uSis and Codes')

Computer Science 2017-2018  - 1 March 2018

Chemistry and LST 2017-2018  - 27 February 2018

ICT in Business and the Public Sector 2017-2018    14-3-2018

>>post-Experience (evening classes)

Industrial Ecology 2017-2018 - 4-9-2017
check the links on the right hand side of the IE-page

Media Technology 2017-2018  - 31-10-2017

Mathematics 2017-2018  - 26-2-2018

Statistical Science for the Life and Behavioural Sciences 2017-2018  10-12-2017

Physics 2017-2018 - Check the Physics Information Pages For now you can find the Astronomy-Physics classnumbers here

Specialisation Science Communication and Society

The SCS specialisation programme comprises a number of courses. Find HERE the classnumbers you need to enroll for the examination of grade-registration.

Specialisation Science Based Business

Find HERE the classnumbers you need to enroll for the examination of grade-registration.


Any questions about the contents of studies in the next year? Please check the E-study guide first and then the website of your study program. Finally contact your study advisor.

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Minors 2017 - 2018

The information about the minors is available on the Minor- website of Leiden University.

The 'Science' minors are:

Advanced Life Science and Technology

You should register in the system of the Delft University (Osiris). A link to that system is in the document.

Biodiversity and Natural Environment 4000MBDNEN
Data Science  4000MDASCN
Computational Approaches to Disease, Signaling and Drug Targets 4000MCOADN
Human Evolution 4000MHUEVN
Modern Drug Discovery 4000MMODDN
Molecular Biotechnology 4000MMBION
Quantitative Biology 4000MQBION
Science and Research-Based Business 4000MSRBBN
Sustainable Development 4000MDONTN
Geo-Resources for the Future (Delft TA-MI-192-17) 4000MGEORN


After you are admitted to a minor you should enroll for the examinations of the courses in the minor. If the classnumbers are available, the name is marked as a hyperlink.

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Honours College Beta and Life Sciences 2017-2018


Classnumbers 2017-2018 (5-2-2018)

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Courses offered by the Faculty of Science

Every year a number of courses are not offered by a specific institute or study but by the Faculty of Science

In 2016-2017 the following courses are on offer:

For Bachelor (and sometimes Master students)

  • Complex Networks
  • Keerpunten in de geschiedenis van de natuurwetenschappen
  • On being a scientist

For Master students

  • Science and the Public
  • Science Methodology

Class numbers to sign up in uSis (5 February 2018).

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Transcript of Records

If you need an authenticated Transcript of Records (NL: cijferlijst) from the Graduate School Office (Educatief Centrum), you can send an email to Transcript@science.leidenuniv.nl. Mention your studyprogramme in the subject-line and give the information that is asked for in the mail.

Please allow at least two days for processing your request.

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Questions on uSis topics

Unable to logon to uSis? Here you can find more information on you ULCN account.

For other questions, mail your question to usis-fwn@science.leidenuniv.nl, quoting your name, student number and degree programme.

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Course and exam enrolment

Enrolment and/or cancellation of enrolment for all exams, resits and practicals is mandatory. This also applies to the Bachelor Research Project (see below for more information). Enrolment for any study activity should be completed before the specified closure date. Find out below how to enrol for study activities and how to cancel your enrolment, if necessary.

You have to enrol for all exams, resits, practicals and research projects before the closure date of that particular study activity. The default closure date is 10 calendar days before the exam date, but there are exceptions. The deadline for enrolment and cancellation of enrolment is up until 23.59 hrs on the closure date of the exam. Please find an overview of all closure dates in the Examination schedules.

Follow the steps below to sign up for courses and exams:

  1. Login at uSis with your Blackboard account.
  2. Click on 'Main Menu' and go to 'Self Service'.
  3. Click on 'Student Center'.
  4. Click on 'Enrol' and then choose 'Enrol by entering the class number'.
  5. Enter the class number of the study activity as listed in the 'uSis studieactiviteit' column of the Examination Schedule. Click on ‘Continue’.
  6. Select the class the appears in the bottom and click on ‘To shopping cart’.
  7. The course can now be found under ‘Shopping cart’. Go to this page and select the course. Click on ‘Enrol’.
  8. After succesful enrolment you will receive a confirmation email. Please note! Only if and when the class appears under 'My Class Schedule' in uSis, your enrolment is valid and final.

The Bachelor Research Project also requires enrolment through uSis. Make sure to enrol for the correct study activity. For the academic year 2017-2018 the codes in the table below apply. Study activity codes for previous years can be found in the respective examination schedules.

Astronomy (BSc) 2017-2018 Class number EC Level Study activity
Bachelor Research Project (Astronomy) 4072BRP18 18 400 14508
Bachelor Research Project (Astronomy & Physics) 4602BOANP 20 400 14509
Bachelor Research Project (Astronomy & Mathematics) 4602BOWIS 24 400 14510
Bachelor Thesis and Presentation (Astronomy) 4072BPTH4 4 400 14515
Bachelor Thesis and Presentation (Astronomy & Physics) 4602BOANT 4 400 14516

To cancel your enrolment for a course or exam, follow the same procedure in uSis as described above for enrolment. Of course you need to select 'Cancel enrolment' instead of 'Enrolment'. Please note! Only if and when the class disappears under 'My Class Schedule' in uSis, your cancellation is valid and final.

Timely enrolment for study activities is your own responsibility. Failing to enrol or to cancel your enrolment in time will have consequences. If you do not enrol before the closure date, your grade will not be registered. Failing to cancel your enrolment, your chance for the exam will be considered as used. Please note that resits always require separate enrolment.

According to article 4.6.4. of the Rules and Regulations of the Examination Committee, deviations from the procedures for enrolment as described on this page can be imposed or allowed. More information on this can be found in the Examination Protocol Physics & Astronomy 2017-2018 (in Dutch).

If you cannot enrol or cancel your enrolment via uSis, you can alternatively enrol by sending an email to usis-fwn@science.leidenuniv.nl before the closure date or go to the Graduate School Office in person before the closure date (Gorlaeus Lecture Hall, B1.14).

If you encounter technical difficulties in enrolling or cancellation of your enrolment in uSis, send an email to usis-fwn@science.leidenuniv.nl. Make sure to include your student number, study, the course you want to enrol in and a description of the problem. Also indicate that you refer to information on the uSis website.