One rating scale based on parent report is the Ages and Stages Questonaire.
The Ages and Stages Questionnaire (ASQ) is a Pervasive Developmental Disorder screening test. Pervasive Developmental Disorders are a group of disorders including autism, asperger’s disorder and pervasive developmental disorder, not otherwise specififed (PDD-NOS).
The ASQ has nineteen variations. The variation selected is based on the child’s age.
The ASQ variations cover ages between four (4) and sixty (60) months old. It focus on the child’s abilities in the areas of: communication, motor skills, social skills and problem solving.
Parents responses on the ASQ determine whether their child should receive further evaluation.
How to get it:
The Ages and Stages questionnaire can be bought at:http://www.brookespublishing.com/store/books/bricker-asq/