Many users of the NEO-Five Factor Inventory (NEO-FFI; Costa & McCrae, 1992) are unaware that Saucier (1998) developed item cluster subcomponents for each broad domain of the instrument similar to the facets of the Revised NEO Personality Inventory (Costa & McCrae, 1992). In this study, I examined the following: the replicability of the subcomponents in young adult university and middle-aged community samples; whether item keying accounted for additional covariance among items; subcomponent correlations with a measure of socially desirable responding; subcomponent reliabilities; and subcomponent discriminant validity with respect to age-relevant criterion items expected to reflect varying associations with broad and narrow traits. Confirmatory factor analyses revealed that all subcomponents were recoverable across samples and that the addition of method factors representing positive and negative item keying improved model fit. The subcomponents correlated no more with a measure of socially desirable responding than their parent domains and showed good average reliability. Correlations with criterion items suggested that subcomponents may prove useful in specifying which elements of NEO-FFI domains are more or less related to variables of interest. I discuss their use for enhancing the precision of findings obtained with NEO-FFI domain scores.Most researchers have agreed that personality traits can be measured in hierarchical tiers that vary in generality (Cattell & Krug, 1986;Costa & McCrae, 1997;Eysenck, 1998;Goldberg, 1990). Traits at higher levels of multistratum taxonomies are merely composites of more fine-grained specific traits. For example, within the Five Factor Model of personality (Costa & McCrae, 1997;Digman, 1990;Goldberg, 1990;John & Srivastava, 1999), the broad trait of Conscientiousness is composed of narrow attributes such as self-discipline, achievement orientation, and orderliness. The commonly used Revised NEO Personality Inventory (NEO-PI-R; Costa & McCrae, 1992) permits users to capture information about such higher order broad traits as well as the lower order, narrow traits that compose them (cf. Costa & McCrae, 1995).The 60-item NEO-Five Factor Inventory (NEO-FFI; Costa & McCrae, 1992) is a brief version of the NEO-PI-R designed to provide speedy and convenient measurement of the Five Factor Model domains; however, it does so by relinquishing information about the narrow traits that comprise each broad factor. To remedy this, Saucier (1998) derived item cluster subcomponents for the NEO-FFI that provided a more specific level of trait measurement. These subcomponents are somewhat similar, although not as specific, as the Copyright © 2007 facets of the full length NEO-PI-R and are listed in Table 1. In their development, these subcomponents evidenced strong average internal consistency comparable to NEO-PI-R facets (e.g., an average Cronbach's of .70 in a development sample and .66 in a crossvalidation sample compared to average NEO-PI-R facet of .70) and captured the majority (a...