What is the difference between the Blue Series and Light Blue series?
These two series have nearly the same lesson material. Comparing with the Light Blue grade levels 1-4, there are only a few minor differences: there are few pages here and there that are in one series but not in the other. The MAIN difference is in how the material is organized. The Light Blue Series goes by grades, and being a complete curriculum also includes tests & cumulative reviews. The Blue Series just consists of worktexts for various topics, and the material in each book usually spans 2-3 grade levels. So, which you would choose depends mostly on your goals: Do you wish to have a complete curriculum for a given grade level? Go Light Blue. Do you wish to review/reteach certain topics only? Go Blue. Do you want to cover all topics as in a full curriculum but without mentions of grade levels? Blue Series can work there as well.
