The book basically says "Put stuff in front of them and see how they get on" 
It has chapters on the development of weaning - why we are so driven by purees, and what people did before the invention of purees (I'm not sure, but I think it was when there were dinosaurs)
But it basically comes down to Let Them Figure It Out For Themselves, or food before one is just for fun. Let them explore what tastes go with which texture (and what it looks like whole, rather than the confusing issue of beige puree could be bread, potato, porridge, banananana, cauliflower or chicken).
Oh, and it talks about the gag reflex, which is totally different from choking. Don't panic when they gag, it's something they have to learn to deal with before it moves further back in their mouth. It's designed to stop them choking, so let them learn how to move their food back out of the way so they can chew it down to swallow.
Just5 - I know exactly what you mean! I'm surprised at how much does come out exactly as it went in. I'm sure that will change as her gut matures and she learns to chew better, but it does make for interesting viewing 