classEx is provided as a free service by the University of Passau. Lecturers and experimenters need login credentials to login at http://classEx.uni-passau.de. Participants do not need login credentials . Login credentials can be created with the following form. If your institution is already registered with classEx and you use an institutional email address, your account will be automatically activated. Otherwise, the activation will be processed manually. In this case, it may take some days until your get your login credentials. If you have any issues, please contact us at classEx@uni-passau.de.