As said in a previous post, this is really the best way to force students to actually come to grips with, digest, and analyze the lab. My confession is that we usually do about 9, not the full 12. I do require that all labs be typed, this makes grading much easier than coping with scrawls in a lab notebook. I too have been in awe of the recent discussion about lab notebooks. I'm also lucky enough to belong to the Biology place.
Students have to submit the lab quiz before they perform the lab.
That was a mistake. The students were careless in their work and did not learn as much as when they have to go through the entire thought process of a lab report. This year it is back to full reports. This consists of an informal condensed version of the procedure. It shows me they are prepared, and is a quick and easy reference for them to follow as they work through the steps of the lab.