ABSTRACT
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. Project Epsom compared a range of the better-known personality questionnaires to determine which among them are the more valid measures of work performance. The Performance 360 assessment is a separate instrument from the Saville Consulting Wave questionnaires, which was designed specifically to measure work performance. This chapter provides work performance criteria against which the different personality questionnaires used in Project Epsom can be compared. Crucially, the Performance 360 assessment provided independent measures of the effectiveness of the individual in their job. Total job performance was measured through a three-item Global Performance scale. This global measure was chosen to ensure a standardised assessment across all of the questionnaires and represents a view of performance at work in terms of applying specialist knowledge, accomplishing objectives and demonstrating potential.
