Class sizes is a huge issues for schools, so when I saw this article, I was very interested. Having worked at a university once, I know how such a tool can be very useful. If used properly, it could be a great cost savings for many universities. Of course the question comes down to, how invasive will this technology be? Like in the corporate world, there are some great tools out there but they must be balanced with privacy. I am a big fan of the opt in option.