Verification of the Japanese Version of Greene’s Moral Dilemma Task’s Validity and Reliability

The moral dilemma task developed by Greene et al., which comprises personal and impersonal moral dilemmas, is useful for clarifying people’s moral judgments. This study develops and validates a Japanese version of this questionnaire. Ten new questions were added to the Japanese version using back-translation, and its internal validity was tested. A second survey was conducted among the same participants one month after the first survey (n = 231). The intraclass correlation coefficient through retesting was found to be 0.781. Test-retest, internal consistency, and criterion-related validity were confirmed by retesting the Japanese version of the moral dilemma task. Moral judgments differed in gender, with women and men tending to be more utilitarian in situations where emotions were less and more likely to be involved, respectively. The association between age and deontological moral judgments was also observed.