Many of them were developed for other users, but some have been able to provide useful input to social science studies of information technology. Multipurpose data sets are often collected by organizations dedicated to this task such as the Institute for Social Research (ISR) at the University of Michigan (see ‹http://www.isr.umich.edu/›), the National Opinion Research Center at the University of Chicago (see ‹http://www.norc.uchicago.edu›), and several other research organizations. Many such multipurpose data sets are maintained by organizations like the Inter-university Consortium for Political and Social Research (ICPSR, see ‹http://www.icpsr.umich.edu/›), which is supported by member-university subscriptions. ICPSR, located within the Institute for Social Research at the University of Michigan, is a membership-based, not-for-profit organization serving member colleges and universities in the United States and abroad. Data sets can be found online at ‹http://www.isr.umich.edu›.