Teachers use curricula when trying to see what to teach to students and when, as well as what the rubrics should be, what kind of worksheets and teacher worksheets they should make, among other things. It is actually up to the teachers themselves how these rubrics should be made, how these worksheets should be made and taught; it's all up to the teachers. In a practical understanding, though, there is no concrete way to say what methodology is right to use. But it is also true that the way in which a certain topic is taught habitually resolves what is actually taught. This is why it is required to make a distinction between the official or planned curriculum and the de facto curriculum; the one that is formal and the one that is actually taught in schools.