A major research initiative, Project Epsom, compared the validities of a range of the most popular personality questionnaires using the same sample and the same work performance measures. In this study the Saville Consulting Wave® Professional Styles was the most valid questionnaire in terms of measuring job performance.

The questionnaires compared were validated against the externally-developed SHL Great Eight competency framework (Kurz & Bartram, 2002) and a global performance measure, in order to ensure fairness of comparison and to avoid bias towards the Saville Consulting questionnaires. Great care was taken in the use of these work performance criteria and the equations for predicting work performance published by Bartram (2005) were utilized for the Occupational Personality Questionnaire (OPQ®).

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