The Adolescent Brain Cognitive Development (ABCD) study is a large-scale research initiative tracking the brain development of over 10,000 9–10 year olds across the United States through adolescence. The study uses advanced neuroimaging techniques to examine brain structure and function relevant to adolescent development and addiction. The imaging procedures were developed by the ABCD Data Analysis and Informatics Center (DAIC) and the ABCD Imaging Acquisition Workgroup, with methods optimized and harmonized across 21 sites. The study includes a variety of imaging tasks, such as the Monetary Incentive Delay (MID) task, the Stop Signal task (SST), and the Emotional n-back (EN-back) task, which measure domains such as reward processing, motivation, impulsivity, working memory, and emotion regulation. The imaging protocol is designed to be developmentally appropriate for 9–10 year olds and is compatible with three 3T scanner platforms. The study also includes measures of head motion and correction to ensure data quality. Preliminary results indicate that the procedures are feasible and that the data are of high quality, with nearly 90% completion rates for all scan types. The study is based on an open science model, with data being released monthly for public access. The ABCD study aims to provide a unique data resource for understanding the biological and environmental factors that impact adolescent brain development.The Adolescent Brain Cognitive Development (ABCD) study is a large-scale research initiative tracking the brain development of over 10,000 9–10 year olds across the United States through adolescence. The study uses advanced neuroimaging techniques to examine brain structure and function relevant to adolescent development and addiction. The imaging procedures were developed by the ABCD Data Analysis and Informatics Center (DAIC) and the ABCD Imaging Acquisition Workgroup, with methods optimized and harmonized across 21 sites. The study includes a variety of imaging tasks, such as the Monetary Incentive Delay (MID) task, the Stop Signal task (SST), and the Emotional n-back (EN-back) task, which measure domains such as reward processing, motivation, impulsivity, working memory, and emotion regulation. The imaging protocol is designed to be developmentally appropriate for 9–10 year olds and is compatible with three 3T scanner platforms. The study also includes measures of head motion and correction to ensure data quality. Preliminary results indicate that the procedures are feasible and that the data are of high quality, with nearly 90% completion rates for all scan types. The study is based on an open science model, with data being released monthly for public access. The ABCD study aims to provide a unique data resource for understanding the biological and environmental factors that impact adolescent brain development.