How I Spent My Summer Vacation Protesting Bush

The SAT will soon include an "essay test." Let's listen in in the test's development as they decide the criteria in this most subective of gradings:

For the first time in the 67-year history of the SAT, the March 12 test will include a written essay along with revised reading and math exams. For the millions of high school juniors and seniors who will ultimately take the test, as well as the thousands of U.S. colleges that will use them in determining whether to admit those students, the stakes in deciding how to score the test could hardly be higher.

[...]

Brian A. Bremen, an English professor at the University of Texas at Austin, notes that the writer provides only one real example. Nevertheless, he says, the writer displays "a clear chain of thought" and should be rewarded, "despite his Republican tendencies."

What bias?