Fig 1. Interface for assignments und their execution in Bettermarks.

(1) Teachers and students can select from a library with over 100 different books. Each book contains an introduction as well as different mathematical problem sets. (2) A problem set contains several individual problems. (3) When students compute a problem and submit an answer, they receive immediate feedback on whether their answer is right or wrong. Students have two attempts on each problem. (4) Students may request up to one hint when computing a problem.