The author reviews Childhood Autism Rating Scale-Second Edition (CARS2), a useful tool for supporting the diagnostic process and for forming intervention recommendations once a diagnosis has been made. CARS2 consists of three rating forms designed to identify symptoms associated with autism spectrum disorders (ASD). Published in 2010, the CARS2 builds on its predecessor by adding an additional rating scale intended to identify individuals with high-functioning autism (CARS2-HF). More specifically, the CARS2-HF can be used for individuals age six and older who have an IQ above 80 and who exhibit fluent communication. The original Childhood Autism Rating Scale (CARS) has been retained in its original form and renamed the Childhood Autism Rating Scale-Second Edition-Standard Version (CARS2-ST). In addition to the CARS2-ST and CARS2-HF, the second edition includes a new parent rating scale, the Questionnaire for Parents or Caregivers (CARS2-QPC), which may be used in tandem with the CARS2-ST or the CARS2-HF.