Over three decades, for-profit schools added students at more than six times the rate of traditional colleges and universities. However, that growth also sparked controversy over their marketing techniques to attract students and led recently to tougher regulations. The new rules require for-profit education companies to offer programs that prepare students for “gainful employment” so they can pay down their school loans and reduce their ratio of debt to income. Those changes have slowed new enrollments significantly, so it is unclear whether for-profit schools will continue to outpace more traditional institutions of higher education in the future.