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: www.lucid.ac.uk) 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 Unpublished manuscript, University of Liverpool.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 https://osf.io/kau5f/. 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: https://hdl.handle.net/1839/970ccc8e-aaa2-4fc6-af72-512e4f58a127. 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. **Published papers** based on the Language05 project data are below and can also be downloaded from https://www.mpi.nl/people/rowland-caroline/publications Bergelson, E., Soderstrom, M., Schwarz, I., Rowland, C. F., Ramirez-Esparza, N., Hamrick, L., … Cristia, A. (2023). Everyday language input and production in 1001 children from 6 continents. Proceedings of the National Academy of Sciences of the United States of America, 120(52): 2300671120. doi:10.1073/pnas.2300671120.Download from: https://pure.mpg.de/rest/items/item_3556429_2/component/file_3556560/content Monaghan, P., Donnelly, S., Alcock, K., Bidgood, A., Cain, K., Durrant, S., Frost, R.L.A., Jago,, L.S, Peter, M., Pine, J.M., Turnbull, H., & Rowland, C.F. (2023). Learning to generalise but not segment an artificial language at 17 months predicts children’s language skills 3 years later. Cognitive Psychology, 147: 101607. doi:10.1016/j.cogpsych.2023.101607. Download from https://pure.mpg.de/rest/items/item_3556429_2/component/file_3556560/content Lee, C., Jessop, A., Bidgood, A., Peter, M. S., Pine, J. M., Rowland, C. F., & Durrant, S. (2023). How executive functioning, sentence processing, and vocabulary are related at 3 years of age. Journal of Experimental Child Psychology, 233: 105693. doi:10.1016/j.jecp.2023.105693. Download from https://pure.mpg.de/rest/items/item_3511912_4/component/file_3511920/content Durrant, S., Jessop, A., Chang, F., Bidgood, A., Peter, M. S., Pine, J. M., & Rowland, C. F. (2021). Does the understanding of complex dynamic events at 10 months predict vocabulary development? Language and Cognition, 13(1), 66-98. doi:10.1017/langcog.2020.26. Download from https://pure.mpg.de/rest/items/item_3257788_4/component/file_3306973/content Cristia, A., Lavechin, M., Scaff, C., Soderstrom, M., Rowland, C. F., Räsänen, O., Bunce, J., & Bergelson, E. (2021). A thorough evaluation of the Language Environment Analysis (LENA) system. Behavior Research Methods, 53, 467-486. doi:10.3758/s13428-020-01393-5. Frost, R. L. A., Jessop, A., Durrant, S., Peter, M. S., Bidgood, A., Pine, J. M., Rowland, C. F., & Monaghan, P. (2020). Non-adjacent dependency learning in infancy, and its link to language development. Cognitive Psychology, 120: 101291. doi:10.1016/j.cogpsych.2020.101291. Download from https://pure.mpg.de/rest/items/item_3204583_3/component/file_3215236/content Peter, M. S., Durrant, S., Jessop, A., Bidgood, A., Pine, J. M., & Rowland, C. F. (2019). Does speed of processing or vocabulary size predict later language growth in toddlers? Cognitive Psychology, 115: 101238. doi:10.1016/j.cogpsych.2019.101238. https://pure.mpg.de/rest/items/item_3165602_4/component/file_3165603/content **Preprints/manuscripts** based on the Language 05 project data: Rowland, C. F., Bidgood, A., JOnes, G., Jessop, A., McLaughlin, P., Pine, J.M. Durrant, S., Peter, M. S. Peter, M. S., Durrant, S., Jessop, A., , Pine, J. M., & (under review).Simulating the Relationship between Non-word Repetition Performance and Language Growth in 2-year-olds: Evidence from the Language 0-5 Project. https://osf.io/9s4d7/ Donnelly, S., Kidd, E., Verkulien, J. & Rowland, C. F. (under review). The separability of early vocabulary and grammar knowledge. Jago, L., Peter, M. L., Bidgood, A., Durrant, S., Pine, J. M., Rowland, C. F. (under review). Individual differences in productive vocabulary: Identifying children who are slow to talk