Parent-mediated interventions can reduce behavioral and emotional problems in children with ASD. This report discusses the development of the first group parent intervention targeting behaviors "and" anxiety in children with ASD, across the spectrum of cognitive and language ability. 'Predictive Parenting' was developed from the clinical observation (and emerging evidence base) that children with ASD struggle with 'prediction' and anticipating change. It integrates well-established parenting strategies within an ASD-specific framework. The concept was co-created with patient and public involvement panels of parents and adults with ASD. A feasibility study found the programme is acceptable and accessible. Qualitative feedback from participants was largely positive, and critiques were used to inform a larger, pilot randomized controlled trial of the intervention.