A lean startup employs a small-batch approach. Before embarking on a lengthy journey toward product development, the company leaders first test out smaller iterations to be sure that what they are creating is valuable.
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In medicine, there's a fairly large but still finite body of knowledge that you need at hand for most of your daily work. It takes a few years to learn it, but once it's there, it's there. With writing, on the other hand, every new book - indeed, every new story - is a fresh and terrifying reinvention of everything.