The History of the ____ World books and Study Guides are recommended for 9-12 grade and adult learners.
For students younger than 9th grade, we recommend that you use The Story of the World. This article from our FAQ will tell you more about how to use The Story of the World with your intermediate student.
By the time a student is in 9th grade, it is time to move on to more complex and adult learning: forming opinions, expressing them, and persuading others. This requires richer content, which is provided in The History of the World series.
Intermediate students are not ready for the reading level and some of the content in The History of the World.
Although the time periods are the same (Ancients, Middle Ages, etc.), The History of the World covers much more information and it is presented in a way that doesn't align with The Story of the World books. For this reason, we don't have a chart that "synchronizes" the two series.
Extracurricular activities like going to a museum, watching documentaries will coordinate if you place them all in the same time period.