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I used this book with my daughter when she was 4 to 5. It did work but I had to encourage her a lot to do this because she just found this book boring. In the end we never completed this. That said, my daughter is someone who dislikes structured teaching and this book offers a structured curriculum. She’s 7 now and reads at a 9 or 10 year old level, and she taught herself to read eventually at about 5 to 6 years old without this book. That is not to say this is a bad book, just that it does not suit every child.
EDIT : Well after 2 more kids, I’ve changed my mind. I’ve been home educating my kids for the last 4 years and I have used this book successfully to teach both my 2 younger kids to read. Okay so maybe this book doesn’t work for my eldest, but I will give the book 4 stars out of 5 for teaching 2 of my 3 kids to read. It is a bit dry in delivery though, and it did become a bit of a drag doing this with my middle child towards the last 10 lessons or so. But my youngest, for some reason, really loved ALL of the stories in the book, so doing it with him was a joy even up till the end. And because he took to it so well, I bought all of the 20 odd recommended story books for him listed at the end of this book, to be used after he has completed the course, and now he has finished about 15 of them and going on to do the last 5 or 6. If you are going to be doing this, I have to warn you that the reading level required to read the last 3 books really does jump up a bit considerably. Especially the Look Out! Washington D.C. book… It is like a full-on paperback chapter book with lots of words. I’m not sure how my son is going to cope with that. He is a good reader but that book seems to me like a book even 9 or 10 year olds would read, and my son is only 6. But he has coped well with all of the first 15 or so books on the recommended reading list in this book so we’ll see how he does at the last book. I wouldn’t mind putting it aside for a while if he hates it.