High school educators have been using graphing calculators in math and science courses for years, but the arrival of affordable, more versatile personal digital assistants (PDAs) in schools—coupled with the addition of software that turns these handheld computers into graphing calculators—has some educators wondering if it's time for a change.

The news doesn't bode well for the likes of Texas Instruments Inc. (TI). Clearly the dominant seller of graphing calculators to schools, TI has had to search for ways to add computer-like functionality to its machines or risk losing control of a market it has


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