Some Stack issues faced during programming exercises for TyöMAA project

This paper describes mathematical online course targeted to upper secondary school students. The main idea on this course is to motivate students to study mathematics with real-life examples and success in calculations. As students can progress at their own pace on this course, automatic feedback is essential. If feedback is incorrect or misleading, it may have negative influence on motivation. Issues mentioned here are faced during the programming and running the first round of online course.