Personality, behavioral engagement, and psychological adaptation of high school students abroad: A longitudinal perspective on between- and within-person dynamics

International educational mobility is a life event that confronts sojourners with many challenges, such as adapting to a new living environment abroad. Whether these cultural adaptation processes are successful is contingent upon different factors. In the present study, we focused on the role of personality as well as host- and home-cultural behavioral engagement in the psychological adaptation of high school students during an academic year abroad. To that end, we analyzed data from the first four waves of the project Mobility and Acculturation Experiences of Students (MAPS) ( N = 1299 students in a year abroad) using a cross-lagged panel model (CLPM) and a random intercept cross-lagged panel model (RI-CLPM) to address these associations at the interpersonal and intrapersonal level. The analyses revealed the complex interplay between personality, host- and home-cultural behavioral engagement, and adaptation at both the interpersonal and intrapersonal levels of analysis. Moreover, host-cultural behavioral engagement also mediated the predictive effects of personality traits on the psychological adaptation of sojourners in the CLPM. Theoretical implications for personality and acculturation research and practical inferences for supporting students studying abroad are discussed.