It’s become an all-too-familiar theme of business articles and books: How dramatic increases in competitiveness, technological turbulence, deregulation, globalization and information intensity have created perpetual uncertainty in everyday managerial life. This is the kind of uncertainty that eats conventional companies–and traditional management strategies–for breakfast. But Wharton management professor Ian MacMillan has a no-nonsense message for executives: “Instead of continuing to whine about it, what are you going to do about it?” MacMillan and co-author Rita McGrath offer managers some answers in their book, The Entrepreneurial Mindset: Strategies for Continuously Creating Opportunity in an Age of Uncertainty (Harvard Business School Press). MacMillan, who is also director of Wharton’s Sol C.…