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Waste is anything that does not add value to a product, value as perceived by the customer. In lean thinking, the concept of waste is a high hurdle. If a component is sitting on a shelf gathering dust, that is waste. If a development cycle has collected requirements in a book gathering dust, that is waste. If a manufacturing plant makes more stuff than is immediately needed, that is waste. If developers code more features than are immediately needed, that is waste. In manufacturing, moving product around is waste. In product development, handing off development from one group to another is waste. The ideal is to find out what a customer wants, and then make or develop it and deliver exactly what they want, virtually immediately. Whatever gets in the way of rapidly satisfying a customer need is waste. —pxxv, Lean software development (book)