With its first publication in 1927 (then the Strong Vocational Interest Blank), the Strong Interest Inventory enjoys the longest history of all vocational assessment tools developed by researchers (Campbell, 1971). Multiple revisions of the Strong have occurred since this initial effort, and the release of the 2004 Strong represents the most recent version. The purpose of this study is to provide an initial attempt at test calibration between the 1994 and 2004 Strong Interest Inventories, and to demonstrate the overall stability of the interpretive implications of the 2004 Strong. Specifically, this study is an attempt to heed Campbell's (1972) warning that any new revision must gain user acceptance or risk having users continue to rely on the older, more familiar version. First, paired samples t-tests were used to test the hypothesis that no meaningful differences would exist between the means of the parallel content scales of the 1994 and 2004 Strong Interest Inventories, with the overwhelming majority of content scales showing no mean differences greater than one-half standard deviation between any analogous scales. Second, bivariate correlations were used to examine the relation between the analogous content scales of the two versions, with strong positive relations found between the vast majority of the parallel content scales of the 1994 and 2004 Strongs. This finding is arguably the most important in this study as determining how well the content scales across the 1994 and 2004 Strongs calibrate ensures that the interpretation of the scales for the 2004 version closely approximate the interpretation of the scales using the 1994 version.