Supplementary materials for: Examining the psychometric properties of the BIIS-2 in ethnic minority adolescents in Germany - Journal of Psychological Test Adaptation and Development

Understanding how adolescents integrate multiple cultures into their identity is a growing field of research in modern multicultural societies and requires psychometrically sound assessments tools. The Bicultural Identity Integration framework together with the Bicultural Identity Integration Scale 2 (BIIS-2; Huynh et al., 2018) offers an instrument that allows assessing BII with two factors (Blendedness vs. Compartmentalization and Harmony vs. Conflict). However, the psychometric properties of the BIIS-2 remain inconclusive for multicultural youth in Germany. To address this gap, we examined the psychometric properties of the BIIS-2 in a sample comprising 595 diverse ethnic minority adolescents in Germany (Mage = 13.26, SD = 1.3; 45.6% female). Contrary to the proposed two-factor structure (Huynh et al., 2018), our findings provide evidence for a four-factor structure (Blendedness, Compartmentalization, Harmony, and Conflict) which is also supported through unique associations in validation results.