In determining methods and constructs to measure, the workgroup considered the ABCD Study aims and requested methodology outlined by the ABCD Study NIH funding opportunity announcement (https://grants.nih.gov/grants/guide/rfa-files/RFA-DA-15-015.html). The workgroup met weekly or biweekly and identified three primary areas to be measured: 1) factors impacting risk of substance use; 2) assessment of detailed substance use patterns; and 3) consequences of substance use. Constructs within these domains were identified by the workgroup utilizing member input, literature review, and consultation with instrument authors and external experts. During the process of finalizing the battery the workgroup prioritized instruments that demonstrated sound psychometric properties, fit the longitudinal design, were developmentally appropriate, reduced participant burden, were open-access, and could be administered by computer. In order to improve cross-study harmonization, if an instrument fit these criteria, priority was given to instruments provided by PhenX (https://www.phenxtoolkit.org/) Patterns of Substance Use module for adolescents (module #510301), the Monitoring the Future (MTF) Study (http://www.monitoringthefuture.org/) (Institute for Social Research and U.o.M. Monitoring the Future, 2010), the Population Assessment of Tobacco and Health (PATH) Study (https://pathstudyinfo.nih.gov/UI/HomeMobile.aspx) (Hyland et al., 2016), and the
