Study design: The social wellbeing of newly-arrived adolescent migrants in reception education in Flanders (socNAMs).

socNAMs provides a comprehensive and comparative dataset for researchers to identify how students' recent migration and their school setting relates to their social wellbeing, particularly regarding their feelings of loneliness. Results: This study design article delineates a quantitative cross-sectional research study (socNAMs) which successfully developed three questionnaires that were administered with unique and hard to reach populations, newly-arrived adolescent migrants (NAMs) and school staff offering reception education in Flanders, Belgium. At the individual level, socNAMs collected information on: (1) socio-demographic variables of NAMs; (2) migration and family context; (3) social relationships; (4) school experiences; (5) self-perceived wellbeing (physical and social); and (6) experiences with discrimination. The questionnaire developed for NAMs is available in 16 languages. To gain a further understanding of the impact of the school environment on NAMs, socNAMs collected contextual information primarily concerning school social capital by including data collected from teachers and reception-class coordinators. The final sample included 1379 NAMs, 50 teachers and 26 reception-class coordinators, from 35 schools offering reception education.