The from the Pew Internet and American Life Project found that 83% of American Internet users say they use Google as their primary search engine, vastly more than any other individual search engine. Yet despite this, Google is constantly implementing changes to its model, most recently in its efforts to and its attempts to provide more direct answers to user queries rather than the standard list of websites.

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Gartner analyst Whit Andrews (pictured) says that Google actually has a good reason to be paranoid about competition despite the fact that its brand is synonymous with online searches. In this question-and-answer session, we'll ask Andrews about what challenges Google faces in its quest to remain on top and what it would take for a competitor to knock Google off its search perch.

Network World: Google is far and away the top search engine in the world, having an even greater market share of search than it had a few years ago. Does Google really have to worry about other search engines eating up its market share since it's already so firmly entrenched?