When you tell people you’re a trade children’s book editor, people from outside the industry—“civilians”—often assume that you do a lot of focus group research with young readers, and that books are rigorously tested*. Formal, truly representative testing is not really compatible with the creative process that’s so essential to picture books and novels, so what happens in practice isn’t what people imagine. I do occasionally send a manuscript to a trusted young reader, and the feedback is often valuable, but it’s nothing like a focus group. And, of course, consultation with librarians and booksellers is always part of the job, helping us to calibrate our tastes. But writing and illustrating are, after all, art, and art and methodical testing and surveying don’t tend to play well together. In the end, the artists make the books that they envision.
*There’s a lot about testing picture books at Bank Street College in the Margaret Wise Brown bio by Leonard Marcus. Worth reading.