The Interpersonal Antagonism Scale: A Brief Spanish Measure for Assessing the Dark Tetrad of Personality

Abstract

Based on the limited validity evidence of Spanish measures for the Dark Tetrad, we validated the Interpersonal Antagonism Scale (IAS), derived from the Short Dark Triad (SD3) and the Assessment of Sadistic Personality (ASP). Study 1 (n = 1132) examined factor structure, internal consistency, and criterion validity, also assessing the combined SD3 + ASP. Study 2 (n = 76) evaluated test–retest reliability, showing good stability. Study 3 (n = 194) assessed construct validity by comparing the IAS with the Short Dark Tetrad. In conclusion, the IAS is a concise, reliable, and valid instrument for measuring antagonistic personality traits.