Grant Wiggins is writing a great book on reading as blogs (here): each new chapter arrives in my inbox as he writes them. In post 8, he describes the qualities texts need to support learning to read. As I principally blog about science texts for learning, I thought I would respond.
In the first of his blogs, Wiggins points out that while the teaching of the early stages of reading have been very successful, teaching comprehension post decoding has been disappointing. He argues that there is scant evidence of how successful pupils read. And only weak evidence on the strategies that work.