This guide equips healthcare practitioners with the knowledge and structure needed to carry out comprehensive ADHD assessments in children. Drawing on the authors' extensive clinical experience and leadership in ADHD assessment and guideline development, it explains how to evaluate symptoms, functional impairment, and co-occurring conditions with accuracy and confidence. It distils the core principles of effective semi-structured interviewing and demonstrates how tools such as ACEv.2 can be applied within the broader clinical assessment process. The book also provides clear guidance on background information gathering, differential diagnosis, report writing, and post-diagnostic feedback, supporting practitioners beyond the interview itself. Designed for use across public and private healthcare systems internationally, this clear and practical resource is essential reading for healthcare practitioners involved in child ADHD assessment.