"The Ziggurat Model," for individuals across the autism spectrum and across the lifespan, is now even more fine-tuned for early intervention. This book presents a process and framework for designing interventions for individuals of all ages with ASD, while staying consistent with current trends in education, including response to intervention (RTI), evidence-based practices, and positive behavioral supports. "The Ziggurat Model 2.0" is newly updated and expanded with the latest research and a new version of the Underlying Characteristics Checklist for Early Intervention (UCC-EI), in addition to UCC-HF and UCC-CL for individuals with higher functioning and classic autism, respectively. Foreword by Gary Mesibov, PhD.