Derailment: Conceptualization, measurement, and adjustment correlates of perceived change in self and direction.

First, we develop and empirically validate a self-report measure that is sensitive to our conceptualization of derailment (Studies 1-3). Employing the new measure with adult samples, Study 3 demonstrates its predictive ability above and beyond other widely used measures of subjective change and identity distress. Study 4 shows the negative effects of derailment persist independent of whether individuals perceive changing for the better or worse, or actually experience status-changing life events. Study 5 demonstrates the prospective utility of this measure by predicting depressive symptoms 18 months later. Finally, levels of derailment are shown to be reduced by a daily writing experiment that emphasizes goal continuity (Study 6). The discussion situates derailment at the intersection of developmental, clinical, and social psychological literatures as a unique and measurable source of psychological vulnerability, and strategies for attenuating its potentially deleterious impact are suggested. (PsycINFO Database Record (c) 2020 APA, all rights reserved).