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Reading to children is a great (the only?) way to test a children's book. And here's one really cool thing I learned from a favorite publisher of mine (David Fickling):
I was testing out HANDBAG FRIENDS on some children in its very earliest stage (pencil sketches in a paper dummy) and I came to a bit where the children were asking me loads of questions. Like, "What is a Swamp-A-Stomp?" and "Where is the Murky Space Weed?" and "What do you mean Baglodytes?". So much so that I could hardly turn the page. Later, I reported back to David, "Oh dear I think I should write more in there because they're asking lots of questions." And then he said, no, you want them asking questions. It's when they aren't asking questions you need to worry because then they're not engaged. And you know the definition of a boring book, don't you? A book that does the work of the reader for them.
Isn't that great?
Hmm. Come of think of it, that could apply to more than just books...