“…One of the key appeals of IMR is the ability to reach a large number of potential participants cost and time effectively, using procedures such as posting participation requests to newsgroups, to mailing lists, and on Web pages (Barbeite & Weiss, 2004;Musch & Reips, 2000). In psychological IMR at least, these approaches (we include those that involve sending requests to e-mail addresses obtained from Internet databases, such as mailing lists) have prevailed (e.g., Birnbaum, 2001;Browndyke, Santa Maria, Pinkston, & Gouvier, 1998;Buchanan, 2000;Buchanan & Smith, 1999;Coomber, 1997;Corley & Scheepers, 2002;Eichstaedt, 2002;Im & Chee, 2004;Kaye & Johnson, 1999;Krantz et al, 1997;Laugwitz, 2001;Riva et al, 2003;Smith & Leigh, 1997;Szabo, Frenkl, & Caputo, 1996). 1 Interestingly (but perhaps not surprisingly), these studies provide evidence that Internet samples accessed using these methods tend to differ in systematic ways from the undergraduate student samples often encountered in psychological research (for evidence that traditional psychological research relies heavily on undergraduate student samples, see Buchanan & Smith, 1999;Smart, 1966).…”