This is a PDF file I found interesting. It was prepared April 2011 for the Ministries of Health and Education by the New Zealand Guidelines Group by Joanna M McClintock PhD, Clinical Psychologist & John Fraser, Manager Implementation Services, NZGG.
http://www.asdguideline.com/content/documents/0000/0013/ASD_Instruments_Report.pdf
What I want to highlight is below:
2.3 Childhood Autism Rating Scale The Childhood Autism Rating Scale (CARS) is an observation instrument and was developed to identify children with autism compared to children with other developmental disabilities and determine symptoms severity (Schopler, Reichler and Rochen Renner, nd). The CARS was developed for children over the age of two years. As no upper age limit is provided it is not clear at what age the CARS would be inappropriate.
The items for the CARS were derived from five different theoretical perspectives of autism, including Kanner’s description of the syndrome to the DSM-IIIR. Due to this, the CARS does not include some constructs considered important to the diagnosis of autism (Ozonoff, Goodlin-Jones and Solomon, 2005). The CARS is also unable to clearly differentiate Asperger’s disorder or pervasive developmental disorders, however, as Rellini et al (2004) point out the CARS was developed prior to the concept of an autism spectrum.
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