Except for a dip in the first few years after 9/11, the number of students receiving credit for study-abroad programs has been rising steadily. It jumped nearly 150%, to 241,791, between 1996-97 and 2006-07, the latest year for which data is available, says the Institute of International Education, a New York-based non-profit. The House and Senate each have introduced a bill this year that aims to boost that figure to 1 million in a decade. As more students consider study abroad, international education experts say, a confluence of trends could lead to more risks for students.