Higher-order factors assessed by the ISI and PRF.

The Interpersonal Style Inventory and the Personality Research Form were administered to 327 adolescents in order to test hypotheses with regard to the second-order factors that they share in common. The 37 scale scores were intercorrelated and factored by the principal axes method and rotated to an oblique solution. The seven correlated factors were interpreted as Impulse Control, Extraversion-Introversion, Autonomy, Level of Socialization, Achievement Motivation, Liking New Experience, and Adventure Seeking. These confirmed four of the hypothesized factors.