“If reading is to lead to any meaningful knowledge or comprehension, readers must approach a text with an understanding of the relevant social, linguistic and cultural conventions. And if you really consider how the pictures and words work together in consonance to tell a story, you can make the case that comics are just as complex as any other kind of literature.”
Carol L. Tilley, a professor of Library & Information Science based in America has come to the conclusion that in terms of literacy, comics are as good for children as traditional reading books. It's worth taking a look at her summery which touches on the stigma attached to the word comics and (shock) criticism of publishers.
Image taken from Little Mouse Gets Ready by Jeff Smith (Toon Books £10).