Book excerpt: In the first book to describe empirically-supported early intervention with children aged 2-5 years who have or are at risk for ADHD, the authors present a three-tiered model for prevention and intervention that can be implemented at home or in preschool settings. This promising model can be adjusted to the degree of difficulty the child is experiencing and consists of universal intervention strategies, small group skills instruction, and assessment-based behavioral interventions. Lively case examples drawn from the authors' clinical experience illustrate common challenges of implementation. The authors also describe how to foster children's early academic skills and promote their physical safety.