A growing body of research has suggested that narcissistic personality disorder (NPD) contains two factors or types: overt/grandiose and covert/vulnerable. A recent factor analysis of DSM-IV NPD symptoms supported a similar two-factor model. The present research tested this proposed two-factor solution against a one-factor solution (N = 298; 72% patients) using both confirmatory factor analysis (CFA) and an examination of associations between the resultant factors and theoretically relevant criteria (other PDs; depression, anxiety). The results of the CFA supported a one-factor solution. Likewise, the two factors each yielded a similar pattern of correlations with relevant criteria. Together, these results argue against a two-factor structure for the current DSM-IV NPD symptoms. Given the broader research literature suggesting a two-factor structure of narcissism, strategies for assessing both overt/grandiose and covert/vulnerable forms of narcissism in DSM-V are discussed. Narcissistic personality disorder (NPD) is characterized by a "pervasive pattern of grandiosity, need for admiration, and lack of empathy" (1; p.714). While narcissism and NPD have attracted the attention of prominent personality theorists such as Freud (2), Kernberg (3), Kohut (4), and Millon (5), NPD has received little empirical attention. This is at odds with the sizable body of research that exists on the study of narcissism as a "normal" trait (e.g., 6-7). Unfortunately, the degree of concordance between these conceptually similar constructs (e.g., trait narcissism as measure by the Narcissistic Personality Inventory [NPI,8] vs. NPD, as assessed by the DSM-IV) is unclear (9). As a result, it is difficult to be certain that the substantial body of empirical work from the social-personality literature generalizes directly to the study of NPD.One specific area of interest with regard to NPD is its underlying factor structure. Research using alternative measures of narcissism has suggested that there may be two forms of narcissism, which have been labeled "overt" vs. "covert" or "grandiose" vs. "vulnerable" (9-12), that may primarily "share a cognitive orientation to pathological Correspondence: Address correspondence to: Joshua D. Miller, Department of Psychology, University of Georgia, Athens, 542-1173; Fax: (706) 542-8048; e-mail: jdmiller@uga.edu. Publisher's Disclaimer: This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. (12, p. 205). However, the two variants are thought to differ with regard to their relation to self-esteem, negative emotionality, and extraversion/dominance (9-12), with the overt/grandiose "t...