Top Business Schools Seek to Ride a Bull Market in On-Line M.B.A.'s

The trend challenges proprietary universities and may threaten less-illustrious programs

At a roadside restaurant near Hickory, N.C., Cris Howard plugs in her laptop computer and begins working on an essay about the European Monetary Union.

Later that evening, she'll pull off the road at a gas station and check her voice mail to see if her classmates have questions about their joint research

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