I teach math and computer science at a German high school (grade 5 to 13). As a student at a college in Montreal I already enjoyed solving WeBWorK problems. As a teacher after using a commercial software for math homework for a year I got frustrated with the lack of control over problems and finally remembered WeBWorK. I installed a copy on my server and am now working on creating problems (starting with my Linear Algebra class). If everything works out I might try to work on a German translation of the interface.