This is essentially what we are doing, too. My daughter (her own initiative) made me a list of things she wants to learn more about and told me we need to get lots of books out on those things (sky, guinea pigs, rabbits, weather, etc) and so we are going to be learning more on those things based on her interest. This past year we learned so much about birds…and I thought I already knew a lot about birds! I learned so much more. Its amazing to me as well that since it was interest-led for her, just because we “stopped” studying it doesn’t mean she stopped. She still gets books out, asks to look up bird calls on the computer to identify a bird, talks about them, points them out etc. etc. Today while blueberry picking (wild) we heard a great blue heron call and I had never heard that before even though I have seen dozens of the birds. She was so excited!