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An acquisition, also known as a takeover or a buyout, is the buying of one company (the ‘target’) by another. An acquisition may be friendly or hostile. In the former case, the companies cooperate in negotiations; in the latter case, the takeover target is unwilling to be bought or the target's board has no prior knowledge of the offer. Acquisition usually refers to a purchase of a smaller firm by a larger one. Sometimes, however, a smaller firm will acquire management control of a larger or longer established company and keep its name for the combined entity. This is known as a reverse takeover. Another type of acquisition is reverse merger, a deal that enables a private company to get publicly listed in a short time period. A reverse merger occurs when a private company that has strong prospects and is eager to raise financing buys a publicly listed shell company, usually one with no business and limited assets. Achieving acquisition success has proven to be very difficult, while various studies have showed that 50% of acquisitions were unsuccessful.^{[citation needed]} The acquisition process is very complex, with many dimensions influencing its outcome.^[1]