When editing additional information for learning resources (material), the teacher is shown a list of the grades used in his own national educational system, from which he can select the grades that the material is suitable for. The nationality of the teacher is stored in his user profile.
For each national grading system, the corresponding age ranges are known (for instance, "1. luokka" in Finland means 7-8 years old). The selected grades are stored as age ranges ("7-12", for instance).
Whenever someone else is looking a the resource, they see the suitable age range in their own national grading system (so a teacher from Hungary would see the suitable grades in the Hungarian educational system that correspond to the selected age range). In addition to this, the originally selected grade range is shown in parenthesis. Here's an example for a view for a Belgian/Flamish teacher of a material made by a Finnish teacher:
Suitable age range: 2-5 Lager (originally "1-4 luokka" in Finland)
