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FACT CHECK: Are US students really that bad? (LIBBY QUAID, 5/18/09, AP)

The U.S. does trail the most high-achieving countries, mostly developed nations in Asia such as Singapore, Taiwan and Japan.

But the U.S. holds its own in the group that comes next, a group of developed countries that, depending on the test, includes England, Germany and Russia.

In fact, the U.S. has gained on some of its toughest competitors since 1995, making bigger strides in math than Singapore and Japan, and in science than Japan.

That is according to the most recent international tests, the Trends in International Mathematics and Science Study, or TIMSS, the study Obama was citing. A lead TIMSS researcher took issue with the idea the U.S. is trailing.

"Certainly, our results do not show the United States trailing the developed world by any stretch of the imagination," said Ina V.S. Mullis, a Boston College research professor and co-director of the study.

"The Asian countries are way ahead of the rest of developed countries, but mostly the developed countries are relatively similar," Mullis said. "And the United States might be one of the leaders of that group, depending on whether you're talking about math or science in the fourth- or the eighth-grade."