GauchoSpace's quiz feature

I think the quiz feature is currently my favorite GauchoSpace tool (although that might change as I experiment more with lessons). There's a lot you can do with it: I've created at least one quiz for just about every course I've taught, and for quite a few courses, I've made multiple or even weekly quizzes. I particularly like that you can include images, videos, and/or sound files: I think it makes the quiz more dynamic, and the multimodal aspect also makes it possible to test different kinds of knowledge. The image below, for example, is from a quiz I made for a hybrid course I taught last winter: 

The print is too small to see here (and is also in Spanish), but the question is: "According to Melissa [a person interviewed for a short reading students had completed], many Latin Americans are 'kind and friendly'. Which of these pictures contains people that are like that?" Students had to look at the images and decide which one best represented those concepts, both of which are vocab words introduced in that chapter. Option B is the only one with friendly, smiling people: the others are either cold or bullies. Based on which option students selected, I was able to provide them with customized feedback, which I really liked, and I could also quickly and easily pull up the results to see how people did: what the average was for first attempts vs final attempts, the mean class grade, how long each student spent doing the quiz, etc. 

Have you used GauchoSpace's quiz feature? How do you like it?

CBA? More like LOL.

I was a bit disappointed that the van der Kleij et al. article didn't find more substantial results. Computer-based assessment is something that figures fairly heavily into the classes I teach: much of the homework my students compete is via an online platform that has automated versions of some of the textbook activities. While there are some redeeming aspects of this platform--for example, there are animated grammar tutorials that students can watch (and that I can assign to make sure that they watch), and the videos are usually fairly well done--one of my biggest critiques is the quality of feedback students are given. When they get an answer wrong, they're told that they got it wrong, but they aren't told why. After they've exhausted their two allowed attempts, they're shown an answer key with the correct answers, but once again, they aren't offered any sort of explanation as to why their answer was incorrect, why the correct answer is the correct answer, and what they can do to improve moving forward. My "solution" to this has been to try to give them much more elaborated feedback on the homework they had in during class, and to give them credit for this homework based on completion rather than accuracy. This approach seems to have at least partially mollified my students, but honestly, my preferred way of fixing this would be to ax the online platform and use GauchoSpace to design my own activities. :D In a perfect world (read: in a world where I actually had the power to throw out part of the current course requirements and put in something that [I think] would work better), I'd do it in a heartbeat, but things like power and, of course, available time are currently not in my favor. :-/

What have your experiences been with CBA? Do you find the type of CBA offered to your students to be effective? If so, why? If not, what would you like to change about it?