Welcome
Time-sharing Experiments for the Social Sciences (TESS) is an NSF infrastructure project that offers researchers opportunities to test their experimental ideas on large, diverse, randomly-selected subject populations. Investigators submit proposals for experimental studies, and TESS fields selected proposals on a random sample of the United States population using the Internet. TESS thereby allows investigators to capture the internal validity of experiments while realizing the benefits of contact with large, diverse populations of research participants.