Objective: The purpose of the present study was to develop a Korean version of the Beck Cognitive Insight Scale (BCIS-K) and to evaluate its reliability and factorial validity by using a sample of Korean patients with psychotic disorders.

Methods: The Beck Cognitive Insight Scale (BCIS) was translated into Korean and its psychometric properties were then examined. The linguistic equivalence of the translated form was verified by the back-translation method. The final, verified translation was administered to patients at Seoul National Hospital, and the responses of 78 adults were analyzed. We evaluated internal consistency, the relationship between the subscales and the composite index, and the correlation with both the Korean version of the revised insight scale for psychosis (KISP) and the 104-item Present State Examination (PSE-104).

Results: The study results demonstrated that the coefficient α and correlations were similar with those of the original BCIS scale and that the BCIS-K was moderately correlated with the KISP and it was not correlated with the PSE-104.

Conclusion: The findings verified the accuracy of the Korean translation of the BCIS and they confirmed the BCIS-K's capability to satisfy the developers' intent. The results also confirmed that the BCIS-K, like other measures of insight, measures different but related aspects of insight.