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Cisco figured out that mergers between similar-sized companies rarely work, as there are frequently struggles about which team will control the combined entity (think Daimler-Chrysler or Dean Witter–Morgan Stanley). Cisco’s leaders also determined that mergers work best when companies are geographically proximate, making integration and collaboration much easier (think Synoptics and Wellfleet Communication, which were not only about equal in size, but 2,500 miles apart), and they also uncovered the importance of organizational cultural
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Jeffrey Pfeffer (Hard Facts, Dangerous Half-Truths, and Total Nonsense: Profiting from Evidence-based Management)