An openness scale for the California Psychological Inventory

We developed a 36-item scale to measure Openness, using items on the California Psychological Inventory (CPI; Gough, 1957, 1987, 1996), Form 434. Items were initially chosen on the basis of content validity. Five samples (N = 2,375) were used to establish reliability, validity, and norms; 4 samples consisted of university undergraduate students, and 1 comprised applicants for nonmanagement call centerjobs. Internal consistency estimates obtained in each sample averaged approximately .75, and test-retest stability, assessed in 1 sample, was estimated at .84. Cross-correlations with related scales, for example, the NEO Personality Inventory-Revised Openness scale (Costa & McCrae, 1992) and other CPI-based scales, provided evidence of construct validity. Statistically significant predictive validities were obtained in 2 call centerjob-incumbent samples, with range-corrected true validities of .20 to .36 for a number of job performance criteria. Construct and predictive validity were found to be higher than for other scales consisting of CPI items designed to measure Openness or a related construct. Finally, norms were prepared for university undergraduate students (n = 1,847) and nonmanagement service-sector job applicants (n = 528).