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

Aims: 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.

Methods: 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.

Conclusions: In this article, we present the rationale for this study, the methodology of sampling and recruitment, the development and content of the questionnaires, some preliminary descriptive results and the strengths and limitations of the study. Future empirical studies will address the research aims outlined in this protocol paper. In addition, we highlight the opportunities that the dataset provides for advancing research regarding the social wellbeing of NAMs in varying school and national contexts.