The facets of an impostor – development and validation of the impostor-profile (IPP31) for measuring impostor phenomenon

Abstract

The Impostor Phenomenon (IP) is a characteristic, which is composed of cognitions of inauthenticity, in conjunction with fear of failure, as well as fear of being exposed as a fraud. The IP was first described by Clance (1985), who also developed an accompanying questionnaire. However, this questionnaire left room for optimization (item content, pysychometric properties, and the representing IP as a multidimensional construct). Therefore, we developed an item pool of 450 new items based on the theoretical foundation. The core element characteristics are measured using the theoretically derived scales: Competence Doubt, Working Style, Alienation, Other-Self Divergence, Frugality and Need for Sympathy. Based on a German sample (N = 771, 51% female), aged 18 to 70 years, exploratory and confirmatory factor analysis resulted in a selection of 31 items. The six scales show satisfactory internal consistencies between.69 and.92. Initial construct validity showed positive correlations with convergent (Neuroticism) and discriminant measures (Self-Esteem). The Impostor-Profile (IPP31) is a theoretically founded multidimensional german questionnaire that can be applied in research and practice.