Book excerpt: Essential Elements in Early Intervention is a complete sourcebooks and guide for early interventionists, teachers of students with visual impairments, and other professionals who work with young children with visual impairments, dual sensory impairments, and multiple disabilities. It includes comprehensive information on vision and hearing examinations, functional vision and hearing assessments, and effective methods of providing early intervention services. The new edition includes expanded, updated information on federal special education legislation, best practices in early intervention, evidence-based outcomes, and the role of the early interventionist, as well as strategies for working with families and educational teams successfully.