REU sites are established in all fields of science, mathematics, and engineering. Each site usually operates for about ten weeks in the summer and consists of a group of about ten undergraduates who work in the research programs of the host institution. Students are accepted from throughout the country; most come from schools other than the host institution. Each student is assigned to a specific research project, where he or she works closely with the faculty, post-doctorals, and graduate students. In addition, seminars, lunch meetings, and social functions are organized to facilitate interaction between the undergraduates. Students are granted stipends and, in some cases, assistance with housing and travel.

The NSF's Division of Materials Research (DMR) supports REU sites that focus principally on research in materials science and related areas, including condensed matter physics, materials chemistry and physics, and materials engineering. Most DMR-supported materials research science and engineering centers, science and technology centers, and national facilities offer REU opportunities each summer as well.

The complete list of sites can be obtained at http://www.nsf.giv/ftp/MPS/letters/reulist.txt. Women, minorities, and those with disabilities or special needs are particularly urged to apply.