Menge has a history of working with the special needs population, and drew upon those experiences as she created her books. Each one is a great teaching tool, especially when it comes to learning the calendar. Books are a little long for the younger population, but can be broken up to accommodate various lessons. The illustrations leave a bit to be desired, particularly in the earlier books. Many kids can get past that, though, and enjoy the stories. Menge has won several awards for her work.
I have received copies of three of the four books from Dawn Menge, in exchange for doing reviews and interviews with her about them.