2.2.5. Summary
Although somewhat inferior to the standard Big-Five instrument examined here,
the FIPI reached adequate levels in each of the four criteria against which it was
evaluated: convergent and discriminant validity, test–retest reliability, patterns of external
correlates, and convergence between self- and observer-ratings. The FIPI measure
of Extraversion fared the best across the criteria and FIPI measure of Openness
fared least well. Overall our findings suggest that the FIPI instrument can stand as a
reasonable proxy for a longer Big-Five instrument, especially when research conditions
dictate that a very short measure be used.