Subjects (emner) are in a flat structure. With hierarchies, plummer and mason subjects wouldn't float around side by side with bournonville ballet subjects. The hirarchy approach would be usefull when implementing plans. Right now, I have a single subject with tons of plans acting as sub-subjects -because the subject-template are appareantly not available within plans. Something like this would be nicer:
Where Math is main subject divided into sub -subjects. Besides Main-sabject, each of these could have there own plans, thereby adding transparency for the whole subject (fag, in this case Math - the subject you study)
If this is unclear, it is clearly not your fault!