The data updates for the 2009 Journal Citation Reports are now available. Thomson Reuters receives feedback from publishers after publication of the annual JCR in June. This feedback is carefully and systematically reviewed; as a result, selected JCR data may be modified. The 2009 JCR Web data are then reloaded in September to reflect these updates and to fully incorporate all new data in the category and network metrics.
Please note that the list of titles includes 53 journals that were absent from the June release of the JCR. Most of these journals could not have a Journal Impact Factor calculated because one or more issues from 2007 or 2008 had not been received in time for JCR production. Since the Journal Impact Factor denominator was incomplete for these journals they could not be included in the initial release. This year however, the JCR Production and Publisher Relations teams at Thomson Reuters have taken a proactive approach toward claiming of missing issues, with the goal of adding these journals to the JCR update if missing content was received in time. Realizing the importance to publishers of obtaining Impact Factors and having their journals appear in the JCR, every effort has been made to include as many journals in the update as possible.
Because the Eigenfactor(tm) metrics are based on the citation network created across the whole JCR (Science and Social Sciences editions), the addition of new titles will affect the Eigenfactor Score(tm) and Article Influence Score(tm) for all journals.