Born out of one legal battle over affirmative action, the Texas college-admissions policy known as the "top 10 percent plan" is now at the center of another. The University of Texas at Austin is being challenged in U.S. District Court over its 2004 decision to return to using race-conscious admissions criteria after years without them.…

In reaction to the "Hopwood v. Texas" decision, which declared the use of race in college admissions illegal, Texas created a percentage plan that guaranteed admission to students who graduate within a specified percentile of their high school class. Under the Texas plan, any student graduating in the top 10% of his or her high school…