I'm of two minds about this. I don't recall many open *book* tests, but for the few that were I remember difficulty in getting to the section of material quickly enough. Those tests tended to be longer too - it was really better to have the material memorized.
On the other hand, I had many open "cheat sheet" tests. That is, you could prepare and bring in a sheet of paper - some tests were one-side, sometimes two - with whatever you wanted on it. Preparing the cheat sheet was part of the process of studying for me. Choosing what was important to remember and writing it down usually helped me to remember the material so that I didn't *need* to refer to the sheet. It also helped me feel less anxious immediately prior to the test. But, all these tests were at college level.
Yes, I thought most of this type of thing took place with HS and college level tests. I could almost get behind something like the notes or 'cheat sheet', because then the studying/learning is taking place. As DS describes it - it's simply open book. If notes were allowed to be used, chances are that DS wouldn't bother to take the notes, but even that's OK - he either knows it or he doesn't. I believe DS most likely knows the info, but just suppose he doesn't...he doesn't have to - he just has to know where to look and if he's read the stuff before, he could easily skim to find what he's looking for.
It also bothers me a bit that points are given for noting the page on which the answer was found. What if the student knew the answer(s) w/o referencing the book? I understand being able to reference material or really seek specific answers in a text and believe that's a skill in and of itself, but where is the line drawn? How is it demonstrated that one actually *knows* material, as opposed to just knowing how/where to find it? And are state tests and such also open book? <----Sorry, just thinking out loud here.
The more I think about this, the more I really don't care for it - especially if it's the norm and not the occasional or exceptional occurrence. I welcome other opinions, though, as food for thought.