Confirmatory factor analysis (CFA) and item response theory (IRT) were applied to determine the extent to which peer and subordinate ratings of managers on a team-building skill dimension are directly comparable. Simultaneous CFA in the 2 groups of raters suggested that the 2 sets of ratings are calibrated equivalently, and polytomous IRT methods led to similar conclusions. The results were replicated in independent samples of raters. These are encouraging results for practitioners or researchers who compare ratings from these 2 groups. In addition to presenting the empirical findings from the study and illustrating how CFA and IRT methods of testing measurement equivalence compare, the article shows the unique types of information about performance appraisals that IRT and CFA can provide to researchers and practitioners, with implications for future research.