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Checklist for Autism Spectrum Disorder (CASD)

The Checklist for Autism Spectrum Disorder (CASD; Mayes, 2012) is a diagnostic and screening tool.


The CASD is unique because it was designed to assess autism as a spectrum, rather than using distinct subtypes. This approach is consistent with the DSM-5. The 30 items on the CASD were developed to describe the broad range of symptoms (organized into five categories) displayed by individuals with autism spectrum disorder (ASD) in order to help parents and others to understand that relationship between these behaviors and ASD. Moreover, the CASD can be used to design a treatment program by targeting symptoms for intervention. The CASD is administered through a 15-minute semi-structured parent interview, information from a teacher or childcare provider, observations, and review of records. The examiner inquires whether or not each of the 30 symptoms were ever present.


Author (yr) Age Range (yrs) Method of Administration/Format Approx. Time to Administer Subscales
Checklist for Autism Spectrum Disorder (CASD; Mayes, 2012). 1-17

Thirty items scored by clinician based on semi-structured interview with the parent, information from teacher or other care provider, observations of child, and records. Symptoms are scored based on a lifetime occurrence.

15 min.

Five categories include: Problems with Social Interaction; Perseveration; Somatosensory Disturbance; Atypical Communication and Development; Mood Disturbance; Problems with Attention and Safety

Availability: Stoelting,


Author (yr) Sample Size Topic(s) Addressed Outcome
Mayes, Black, & Tierney (2013). 125 - Age Range: 1-16 years Validity

Sensitivity: Low Functioning (DSM-5 = 98%; DSM-IV = 100%). PDDNOS (DSM-5 27% identified as ASD). Specificity: 100% for DSM-5 and 97% for DSM-IV

Author (yr) Sample Size Topic(s) Addressed Outcome
Murray, Mayes, & Smith. (2011). 29 - Age Range: 12-17 years Validity

Agreement between the CASD and ADI-R was 93.1%. (kappa = .70).

Author (yr) Sample Size Topic(s) Addressed Outcome
Mayes SD, Calhoun SL, Murray MJ, et al. (2009). 520 - Age Range: 1-6 years Validity Reliability

r = correlation

Validity: The CASD differentiated students with autism from those with ADHD with 99.5% accuracy and students with autism from typically developing students with 100% accuracy.

High diagnostic agreement was found with existing measures including the CARS (98%) and GADS (94%).

Reliability: Interrater reliability was high (r = .72, p <.0001). Clinician and parent diagnostic findings were similar to one another (90% agreement).

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