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Previous research on identity development among adolescents has focused on the processes involved. However, it is unclear how the sense of identity (synthesis and confusion) develops and how it relates to life satisfaction. This study aims to examine the relationship between sense of identity and life satisfaction among Japanese youth living in the urban Kanto, Kansai, and Chubu areas. A total of 5,047 Japanese youth (49.7% female; Time 1 M age = 17.08 years, range = 12-22 years) in four age groups (early adolescence, middle adolescence, late adolescence, and young adulthood) participated in a threewave longitudinal study. Latent growth modeling (LGM) analysis revealed that from early to middle adolescence, synthesis continued to be higher than confusion, whereas from late adolescence to young adulthood, confusion tended to be higher than synthesis. The results of the LGM further showed that the change in synthesis was positively related to the change in life satisfaction and the change in confusion was negatively related to it in all age groups. Using latent class growth analysis (LCGA), five identity classes were extracted: high synthesis-low confusion, low synthesis-high confusion, high synthesis-high confusion, low synthesis-low confusion, and moderate synthesis-moderate confusion. LCGA revealed that youth in the high synthesis classes had a higher sense of life satisfaction than did youth in high confusion classes. These findings provide critical insights into trajectories of identity formation and the relationship between identity development and life satisfaction among Japanese youth that can inform future research and programs designed to facilitate their identity formation.

The Identity Capital Model proposes that forms of personal agency are associated with identity development as part of the transition to adulthood. This model was examined in two cultural contexts, taking into account age and gender, among college and university students aged 18 to 24 (N ¼ 995). Confirmatory Factor Analyses verified cultural, age, and gender invariance of the two key operationalizations of the model. A Structural Equation Model path analysis confirmed that the model applies in both cultures with minor variationsdtypes of personal agency are associated with the formation of adult-and societalidentities as part of the resolution of the identity stage. It was concluded that forms of personal agency providing the most effective ways of dealing with "individualization" (e.g., internal locus of control) are more important in the transition to adulthood among American students, whereas types of personal agency most effective in dealing with "individualistic collectivism" (e.g., ego strength) are more important among Japanese students.

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The Dimensions of Identity Development Scale (DIDS) provides a new method of researching identity development based on the dual-process model pertaining to lifespan development. This study developed and evaluated the Japanese version of this scale (DIDS-J). Two surveys of undergraduate and high school students showed that the DIDS-J had good reliability and validity and that it consisted of 25 items with five factors: commitment making, identity with commitment, exploration in breadth, exploration in depth, and ruminative exploration. Through cluster analysis of the DIDS-J, five identity statuses were found that were not clearly distinguished by previous scales: foreclosure, achievement, searching moratorium, diffused diffusion, and carefree diffusion. Research using the DIDS-J has two advantages: it enables us to examine the process of identity development among adolescents with a wider age range, and to compare results cross-culturally in future research. The trial investigations compared student scores with those from previous research in Western cultures, demonstrating that DIDS-J may lead to further explanations of identity development.