Bilingual language use is context dependent: using the Language and Social Background Questionnaire to assess language experiences and test-rest reliability

Bilingualism is a multi-faceted experience and bilinguals differ in how they use their languages in daily life. Therefore, assessments of bilingualism that consider the role of (social) context are needed when describing bilinguals. In this study, we evaluated how (reliably) the Language and Social Background Questionnaire (LSBQ; Anderson et al. 2018) describes language experiences of bilinguals living in the UK. Across 163 participants, nine factors were found to describe their daily-life language experiences in different contexts or with different interlocutors. Factors describing language use also correlated with objective English (L2) proficiency. These findings emphasise the need for studies to characterise bilinguals' daily-life language use in more detail and with a focus on the multi-dimensionality of bilingualism. Test-retest reliability (assessed across two weeks) was moderate to substantial, showing that the LSBQ might be a reliable tool to capture these bilingual experiences.