Engaging undergraduate students in research activities has been advocated as an innovative strategy to improve American higher education (Boyer Commission, "Reinventing undergraduate education: A blueprint for America's research universities." The Carnegie Foundation for the Advancement of Teaching, Stony Brook, NY, 1998). This study compared the frequency of undergraduate student research experiences at different types of colleges and universities from the early 1990s through 2004. The results indicate that the frequency of student research experiences increased since 1998 at all types of institutions and that students at research universities were not more likely than their counterparts elsewhere to have such experiences. The findings were consistent across major fields. To live up to their claims, research universities must find additional ways to involve undergraduates in research with faculty members.