Interesting article and very ambitious to address an academic need, but I wonder if the instruction/test environment addresses UDL principles to appeal to a variety of learners or if the multiple choice tests target a narrow definition of math success. I added a blog post above that highlights some of technology's short comings as a platform.
Great point. My feeling is that a lot of higher ed institutions use technology as a way to cut costs, so not much attention is paid to accommodating diverse learners. If I may think back to my own undergrad experience, the prevalent assumption is that you're old enough to seek out additional support on your own when you're stuck or want to learn more. I definitely think though that more attention should be paid to applying UDL principles to educational software (yes, even for adults), so that learning can move beyond passing multiple-choice tests!
Another article on digital textbooks. The author describes how students in Joplin, MO, went digital after the tornado destroyed their schools. Mixed results.