The Revised NEO Personality Inventory (NEO PI-R) is a personality inventory, published in 1990 and keyed the Big Five personality traits. It is a revised version of Costa and McCrae’s (1978) NEO Personality Inventory. The NEO PI-R consists of 240 items. A shortened version, the NEO Five-Factor Inventory (NEO-FFI), comprises 60 items (12 items per domain). Both the NEO PI-R and NEO-FFI have been updated over the years, with their last updates in 2010. While the NEO PI-R is still published, the NEO Personality Inventory-3 (NEO PI-3) is the 2010 revision of the NEO PI-R. The NEO Five-Factor Inventory-3 (NEO-FFI-3) is the 2010 revision of the NEO-FFI. The revised inventories feature updated norms.
The NEO PI-R assesses the Big Five personality traits: Extraversion, Agreeableness, Conscientiousness, Neuroticism, and Openness to Experience. Additionally, the inventory assesses six subordinate dimensions (known as facets) of each of the main personality factors. The test was developed by Paul Costa, Jr. and Robert McCrae for use with adult men and women without overt psychopathology. It was later shown to also be useful at younger ages.