Many retirees have a 401(k) or IRA drawn-down strategy that covers regular expenses, such as mortgage payments, and a bigger-than-expected withdrawal could bump them into a higher tax bracket, Ms. Chapman said.

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Although the combination of donepezil and memantine -- a common strategy in the U.S., but not the U.K. -- had no added benefit, each drug had "independent positive effects, " says Howard, who advises patients at this stage of the disease to continue taking both drugs if possible.

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Perik's target profit margin is the same for the assessment business as for test prep, 20% after tax. (Test prep accounts for 70% of the company's revenues, K--12 the rest.) His risky strategy: Instead of emphasizing customized assessment tests for particular school districts, he plans to deliver a more generic product.

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K. Prahalad, the Indian-born professor of corporate strategy at the University of Michigan's Ross School of Business.

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Gidley-Kitchin believes Vodafone's reported interest in T-Mobile U.K. is illustrative of the strategy of its new, pragmatic chief executive, Vittorio Colao, who's business plan is focused on cash flow more than strategic growth.

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K. Prahalad, an Indian-born author and professor of strategy at the University of Michigan's business school.

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Compare this with the U.K., where the government's economic strategy is heavily back-loaded.

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Glaxo has been funneling cash back to the U.K. daily from banks in euro-zone countries as part of its strategy to reduce exposure to risks of a possible breakdown of the European monetary system.

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