Narcissistic personality disorder (NPD) is diagnosed according to the DSM-5's NPD Diagnostic Criteria. Among other things, they usually have high egocentricity, low social empathy, and a readiness to use others to further their own self-interest. It can also be tested using the Narcissistic Personality Inventory (NPI), a 40-item list developed by Raskin & Terry. The items on this forced-choice test contain pairs of statements such as “Sometimes I tell good stories” (non-narcissistic) versus “Everybody likes to hear my stories” (narcissistic).