A study by the Association of American Colleges and Universities and Claremont Graduate University found a rise in the percentage of students choosing not to disclose their race on college admissions forms. From 1991-2001, the numbers jumped nearly 100 percent, with 5.9 percent of potential students ignoring the racial/ethnic classification question. The trend could cause problems for campuses looking to increase their diversity, according to Carol Geary Schneider, AACU president. She said the exploratory study is the first major step in addressing how college and university campuses can monitor the racial/ethnic background of today’s students.