Note that almost all research results are linear and assume that ‘more is better’ on
personality dimensions, which may not be the case. For example, although police officers
as a group generally score above average on Rule-Consciousness (G+); higher on-the-job performance is often predicted by lower scores on Rule-Consciousness within this above average group – probably because extremely G+ people may be rigidly rule bound (Adcox et al., 1999). Therefore, job performance results need to be taken in the context of the group’s general score
range, and curvilinear relationships should be considered