Food selectivity is the most commonly reported feeding problem in children with Autism Spectrum Disorder (ASD.) Schreck et al. (2004) surveyed 472 caregivers of children between 5 and 12 years of age. They found that 72% of those children diagnosed with ASD had feeding difficulties, significantly higher than same-age peers without ASD. Unfortunately, little is known about the development and maintenance of food selectivity. For children with food selectivity, immediate health risks may not be apparent if the child is growing and gaining weight normally. This article presents guidelines for a data-based approach to objectively assess behavior, develop a plan, evaluate treatment, and continuously track success for food selectivity.