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Know-how (or knowhow, or procedural knowledge) is a term for practical knowledge on how to accomplish something, as opposed to "know-what" (facts), "know-why" (science), or "know-who" (communication). It is also often referred to as street smarts (sometimes conceived as the opposite of book smarts), and a person employing their street smarts as street wise. Know-how is often tacit knowledge, which means that it can be difficult to transfer to another person by means of writing it down or verbalising it. The opposite of tacit knowledge is explicit knowledge.