About the Das-Naglieri Cognitive Assessment System (CAS)
J.P. Das at the University of Alberta spent decades developing what he called the PASS theory of intelligence, an elaboration of Soviet psychologist Alexander Luria's neuropsychological framework. PASS stands for Planning (executive function and strategy), Attention (selective attention and concentration), Simultaneous (holistic visual-spatial processing), and Successive (serial-sequential information processing).
In 1997 Das collaborated with Jack Naglieri at George Mason University to operationalize the PASS theory in a comprehensive cognitive assessment battery. The Cognitive Assessment System (CAS) has 12 subtests organized into the four PASS scales. Each scale produces a standard score; the four can be combined into a Full Scale composite or examined separately as a cognitive profile.
The CAS is particularly valued in neuropsychological assessment because the PASS framework is more directly tied to specific brain systems than the verbal-performance Wechsler framework. It is also valued for assessment of ADHD (where the Planning and Attention scales are diagnostically relevant), learning disabilities (where Successive processing weaknesses can indicate dyslexia patterns), and traumatic brain injury. The CAS-2 (2014) is the current edition.
The 4 subtests
Source
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