Each year, Thomson Reuters receives feedback from publishers after publication of the annual Journal Citation Reports in June. This feedback is carefully and systematically reviewed. As a result, selected JCR data may be modified and adjustments made to metrics such as the Journal Impact Factor. A re-evaluation of 2008 JCR data has been completed, and changes have been made to 55 journals. To see a full list of affected titles, a PDF is available for download here.