“…In this model, the first tier is predicted to be a "free space" which represents the scholarly enterprise in "real time" and is most likely to feature free and timely Web-based publications, while the second tier is thought to be the world of more formal publications that is most likely to continue to be dominated by journals (van Raan, 2001, p. 61). As suggested by the present study and by other studies (Chan, 2004;Crow, 2002;Zhao, 2004), the first tier would primarily serve as an information distribution medium that improves the effectiveness and efficiency of the informal communication, on which scholars have relied heavily to obtain the information they need for their research, while the second tier would primarily serve as an archive and evaluation rather than information distribution device. The faster and wider distribution of information on the Web makes the Web a perfect medium for the initial publication of new research results in the first tier, while the journal has served well as an archive and evaluation device for a long time, which makes it natural to continue its role in the second tier.…”