A basic tenet of the flipped classroom approach is that students come prepared to class and I have found "reading" quizzes good way to help ensure that. (Here I put reading in quotation marks since it can also refer to video lectures.) Put another (stronger) way, I would not attempt any kind of flipped classroom activity without assigning reading quizzes.
I use the quiz function in Absalon, which is the course management system that the University of Copenhagen uses, but I am sure most of what I discuss below can be done with other course management systems such as Blackboard of Moodle.
Some general considerations
* My reading quizzes are usually 5-10 questions covering reading/video material they familiarize themselves with before we meet. If you require more questions to cover the assigned reading/video then you are assigning too much.
* The quiz has two purposes: 1) to encourage students do the reading/watch the videos and 2) to let them know whether they have watched them with sufficient attention
* The quizzes do no contribute to the grade, which allows me to give immediate feedback on the answer. This is really important as it turns the quiz into a learning tool.
* I allow (and ask) them to keep answering until they get all the questions right
* Absalon allows me to label the the quiz as "mandatory", though the repercussions for not taking it is left vague.
* The quizzes are not meant to be extra homework. The questions are easy to answer if you have read the material. I often use true/false questions.
* The last question is always "Did you find anything confusing that you would like explained when we meet?"
* I set the deadline for the quiz at midnight the night before we meet. There is good evidence that sleep is important for the transfer of knowledge from short- to long-term memory.
* Absalon has a nice feature where I can selectively send email to students who haven't taken the quiz yet. If I remember, I do this around 8 pm.
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