The Cognitive Inventory for Borderline Personality Disorder (KIB). An investigation of its reliability and validity

Background: The Cognitive Inventory for Borderline Personality Disorder (KIB) was developed by clinical and scientific experts for measuring typical beliefs and associated behavioral and emotional symptoms. Objective: The psychometric characteristics of the KIB were investigated to confirm the results of a pilot study. Methods: The reliability, convergent and divergent validity, differential validity, and the sensitivity to change were assessed in two clinical (borderline personality disorder and axis I disorders; n = 150) samples and a nonclinical sample (n = 70). Results: Results indicate a high reliability and a high convergent validity, satisfactory divergent validity, good differential validity, and a satisfactory sensitivity to change. Conclusions: The KIB allows a reliable and valid measurement of beliefs and rules in patients suffering from BPD. Its main distinguishing feature is its focus on subjective functions of self-harming behavior.