Sure it's simple, writing for kids. Just as simple as bringing them up.

All you do is take all the sex out, and use little short words, and little dumb ideas, and don't be too scary and be sure there's a happy ending. Right? Nothing to it. Write down. Right on.

If you do all that you might even write Jonathan Livingstone Seagull and make twenty million dollars and have every adult in America reading your book.

But you won't have every kid in America reading your book. They will look at it, with their clear, cold, beady little eyes, and they will put it down, and they will go away. Kids will devour vast amounts of garbage (and it is good for them) but they are not like adults; they have not yet learned to eat plastic.