Enrollment in for-profit colleges has grown from about 365,000 students to almost 1.8 million in the last several years. These colleges offer degrees and certifications in programs ranging from business administration to cosmetology. In 2009, students at for-profit colleges received more than $4 billion in Pell Grants and more than $20 billion in federal loans provided by the Department of Education (Education). GAO was asked to (1) conduct undercover testing to determine if for-profit colleges' representatives engaged in fraudulent, deceptive, or otherwise questionable marketing practices, and (2) compare the tuitions of the for-profit colleges tested with those of other colleges in the same geographic region. To conduct this investigation, GAO investigators posing as prospective students applied for admissions at 15 for-profit colleges in 6 states and the District of Columbia. The colleges were selected based on several factors, including those that the Department of Education reported received 89 percent or more of their revenue from federal student aid. GAO also entered information on four fictitious prospective students into education search Web sites to determine what type of follow-up contact resulted from an inquiry. GAO compared tuition for the 15 for-profit colleges tested with tuition for the same programs at other colleges located in the same geographic areas. Results of the undercover tests and tuition comparisons cannot be projected to all for-profit colleges. Detailed Results of Undercover Tests is appended. (Contains 3 tables and 11 footnotes.)