Homework problems, content pages, and other resources
such as images, movies, and simulations applets were made
available online, replacing a traditional textbook. Over the
course of the semester, 422 online problems were assigned
15% of the course grade. 90% correctly solved homework
would result in full homework credit, i.e., students get 100%
homework credit for solving 380 problems, with no bonus for solving more. Numerical problems typically had 12 allowed tries, multiple-choice and other problems less, in correspondence to the number of answer options.