Quantifying language experience in bilingual and trilingual children

The data in this repository were collected in France, the Netherlands and the UK between 2020 and 2022 to inform the validation of the Q-BEx questionnaire (www.q-bex.org). Children between the ages of 5 and 9 were tested individually to assess their proficiency in the societal language (i.e., French, Dutch or English), as well as their non-verbal intelligence and working memory. One of their parents or caregivers also filled in the full version of the Q-BEx questionnaire. The repository includes data from 299 children (FR: n=78, NL: n=117, UK: n=104), although some measures are not available for all children.