Universality of Moral Identity Scale
Objective The Aquino and Reeds’ Moral Identity Scale was developed with the purpose of measuring how people evaluate their private (Internalization subscale) and public (Symbolization subscale) moral identity. MIS became one of most commonly and broadly used measures in moral studies. The aim of this study is to validate Polish adaptation of MIS by analyzing its structure and relation to similar measures like Stake’s Moral Self Concept Scale and the Jordan, Leliveld and Tenbrunsels’ Self-importance of Moral Identity Scale, declared past prosocial behaviors and readiness to donate money. Methods We conducted four studies on a total sample of N = 2892 participants. Translation-back-translation procedure was used to maintain semantic, idiomatic and conceptual equivalence of the original scale. Factor structure, reliability, validity and measurement invariance was tested for men and women.ResultsA stable two-factor structure in 10 items was found to replicate over four samples. Results show that reliability α was between 0.71and 0.81 for Internalization, and 0.76 and 0.81 for Symbolization. Validity was confirmed in terms of expected pattern of correlations with morality measures. Configural and metric invariance was confirmed across gender except factor loadings on two items regarding external manifestation of values. Polish normalization for men and women was constructed.Conclusions Polish adaptation of Moral Identity Scale proved to be structurally consistent and valid measure.