User blog comment:Werthead/Official: producers will not wait for Martin to finish the books/@comment-72.68.100.81-20130403190748

What I think is going to happen is that Season 4 is going to be the second half of book 3, and then the last couple of episodes will be Book 4/5. Then Season 5, and at least half of season 6 will be book 4/5, and part of book 6. Then Season 7 will be all book 6, and Season 8 and possibly 9 will be book 7