"The basic mission is to create OERs to replace textbooks in every school subject for every age or grade level for every country in every language needed. Children commonly take five subjects at a time, including Physical Education, divided into semesters, for 12 years of primary and secondary education. There is some variation in this plan, which does not change the fact that this comes to a requirement for more than 100 semester class OERs, without counting electives. The real count is doubtless greater than 300, including academic and vocational subjects, and numerous languages."