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Global Maps of Science based on the new Web-of-Science Categories 

In August 2011, Thomson Reuters launched version 5 of the Science and Social
Science Citation Index in the Web of Science (WoS). Among other things, the
222 ISI Subject Categories (SCs) for these two databases in version 4 of WoS
were renamed and extended to 225 WoS Categories (WCs). Since we previously
used the ISI SCs as the baseline for a global map in Pajek (Rafols et al.,
2010) and brought this facility online (at, we recalibrated this map for the
new WC categories using the Journal Citation Reports 2010. In addition to
Pajek, the new base maps can also be made using VOSviewer (Van Eck &
Waltman, 2010). 

Loet Leydesdorff, Stephen Carley, Ismael Rafols
** apologies for cross postings
Amsterdam School of Communications Research (ASCoR)
Kloveniersburgwal 48, 1012 CX Amsterdam.
Tel. +31-20-525 6598; fax: +31-842239111
[log in to unmask] ; 
Visiting Professor, ISTIC, Beijing; Honorary Fellow, SPRU, University of

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