Internal consistency coefficients for the scales and Total Aggression Index ranged from .63 to .83 for the CAS-Parent Community sample and .72 to .94 for the CAS-Parent Clinical sample. Similar results were obtained for the scales and Total Aggression Index of the Teacher Form, with internal consistency coefficients ranging from .58 to .89 for the Community sample and .72 to .94 for the Clinical sample.
- Test-retest stability for the CAS scales, clusters, and index ranged from .69 to .99 and .84 to .99 for the Parent Form and the Teacher Form, respectively.
- Good interrater reliability coefficients were obtained with median reliabilities of .87 and .97 for the Parent-Parent and the Parent-Teacher samples, respectively.
Validity for the CAS was examined in terms of intercorrelations among the scales and clusters, convergent validity with existing behavioural measures (i.e., BASC-2, CBCL) and domain-specific assessments (i.e. OAS, CDS, IOWA Conners), and clinical validity among varying clinical samples (i.e., ADHD, ODD, CD, SM).