“…It is sufficient to say that the actual technical implementation of the CRS principle varies with the system in many details, but those are important for practicability for the intended usage. It is crucial that users, i.e., both lecturer and students, are able to handle it almost effortlessly to not be distracted from teaching and learning . Lecturers may test a CRS (ideally multiple) prior to implementation with different scenarios, as well as attempt to use the CRS in the role of a student, e.g., to check the login process, submission of responses, and apt display of questions, figures, equations, etc.…”