Many businesses across post-recession America are asking employees to assume multiple roles, transforming the nature of work. Call-center representatives who used to just answer questions or complaints are now trained to sell products or investigate problems.

Many human resources managers are doing more than providing benefits information and running company picnics — they're often revamping entire departments, saving firms the cost of hiring consultants. And engineers often must have the financial acumen to figure the profit margins of their jobs and pick materials accordingly, says David Smith, a managing director for Accenture.

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