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In his FORTUNE.com blog, Managing Editor Andy Serwer writes, "No matter what happens with the economy, the demand for talent will remain. Great companies know that super-motivated, happy, world-class employees are an incredible competitive advantage."

To pick the "100 Best Companies to Work For," FORTUNE works with Robert Levering and Milton Moskowitz of the Great Place to Work® Institute — a global research and consulting firm with offices in 30 countries — to conduct the most extensive employee survey in corporate America.

More than 81,000 employees from 353 companies responded to the 57-question survey created by the Institute. Two-thirds of a company’s score is based on the survey, which is sent to a minimum of 400 randomly selected employees. The remaining third is based on a company’s responses to the Culture Audit questionnaire, which asks detailed questions about demographics, pay and benefits, and open-ended questions on philosophy, communication and more.

Any company that is at least seven years old with more the 1,000 U.S. employees is eligible to be included on the list.