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The Language05 project was a multi-methodological longitudinal cohort study that tracked the language development of 90 English-learning children from 6 months to 4;6 years (2014 to 2019). Its goal was to establish how differences in processing abilities interact with linguistic knowledge, socio-cognitive skills and the environment to predict individual differences in language acquisition. The project was supported by the International Centre for Language and Communicative Development (LuCiD: and funded by the UK Economic and Social Research Council [ES/L008955/1]. The documents here provide more information about the project. To reference this project please cite: Rowland, C.F., Bidgood, A., Durrant, S., Peter, M., & Pine, J. M. (unpub.). *The Language 0-5 Project*. Unpublished manuscript, University of Liverpool. Available from DOI 10.17605/OSF.IO/KAU5F The data for the project is stored at The Language Archive as The Language 0-5 Project Collection, see: This collection contains all data for which the children’s caregivers gave permission for sharing including summary datasheets for data from questionnaires, diaries and experimental tasks, raw audio and audio-video recordings, and transcripts of (some of) the recordings in CHAT or ELAN format. The collection also includes readme documents both for the project itself and for each of the measures, and copies of materials and publicity images and videos.