Subjects and Methods: This is a cross-sectional, school-based survey with a multi-stage sampling method. The participants include a school-based sample of 3534 first to eighth graders was recruited from four areas: Taipei City, Taoyuan County, Tainan City and Chiayi County. Among them, 200students will be reassessed at 2-week interval for the test-retest reliability study. The instruments comprise the Chinese version of Child Behavioral Checklist (CBCL), SDQ, SNAP-IV, and Adult ADHD Rating Scale. The informants include student participants older than 10 years old, their parents, and teachers. The main statistical methods include Pearson correlation, intraclass correlation, Chronbach's α for internal consistency, and mixed model to address lack of independence within the same classes and schools.