My son loved Magic Treehouse at around age 5 and would never have read them if they had been big books. At that age he was intimidated by big books, even if he could read them. Also, he loved and still loves series of books.
I think your idea of a series is good for that reason. But like Colinsmom says, they can't be too short or they are a waste! We've gotten books at a book fair or book sale and DS has read them in the car on the way home, never to look at them again. $7.00 per book, down the drain!!!
DS8 read Harry Potter over a few months and Narnia in about 3 weeks. He's going to start Lemony Snicket which I think is a very long series and will keep him occupied for the rest of the summer maybe! We are lucky that we have friends with older kids giving us piles of books. Our problem at the library with series is that they just happen to be out of a book smack in the middle. Stops DS in his tracks!!
Kate
