Alex Fornito and Jeggan Tiego are joint last authors. K., T.Constable, A.Fornito, and J.Tiego. 2026. “Assessing the Psychometric Properties of the Child Behaviour Checklist in the ABCD Study.” Developmental Science29, no. 4: e70216. Pavlovich, https://doi.org/10.1111/desc.70216 Conflicts of Interest None of the authors have a conflict of interest to disclose. Data Availability Statement The data used in this study were obtained from the ABCD Study, release 5.1, under the terms of a data use agreement.