The purpose of this study was to develop, assess, and provide uses for a measure of perceived auditor ERP systems expertise. A review of the auditor expertise literature and Ajzen's (1991) Theory of Planned Behavior provided a five‐item measure. An assessment of the measure shows that it possesses a high level of reliability, construct validity, and the results of Brazel and Agoglia (2004) support the concurrent validity of the measure. Interestingly, the results suggest that auditor perceptions of ERP systems expertise are not significantly related to general AUDEXP