The authors argue for a significant shift in how clinical psychology researchers conduct construct validation and theory validation tests. They argue that sound theory and validation tests can best be conducted on measures of unidimensional or homogeneous constructs. Hierarchical organizations of such constructs are useful descriptively and…

This study compared differences in preschool children (n=201) clinically diagnosed with specific language impairments (SLI) who were and were not identified through standard psychometric discrepancy criteria. A combination of mean length of utterance, percent structural errors, and chronological age was found to be more useful for predicting a…

The psychometric characteristics of 12 adults with Prader-Willi syndrome (PWS) and a group without PWS but with other similar traits were compared. Results found cognitive, behavioral and educational traits often associated with PWS to be present in both groups, illustrating the importance of control/comparison groups in research establishing…

The initial psychometric properties of the Assessment for Dual Diagnosis (ADD), a new scale designed to screen for psychopathology in individuals with mild and moderate mental retardation, was examined. The ADD was found to have high stability across raters, high stability over time, and good internal consistency. (Author/DB)

This study examined the validity and internal and interrater reliability of the Wing Subgroups Questionnaire, an assessment that classifies children with autism into subtypes. Subjects were 42 students (ages 5 to 22) enrolled in multihandicapped special education classrooms. Findings support the reliability and validity of the questionnaire for…

The use of a traditional syndrome-classification system for aphasics is examined critically from the different perspectives of medicine and psychometrics. Medicine views syndromes as dichotomous (present or not present) and necessarily indicative of an underlying pathognomic state or process, and psychometrics sees performances as varying along a…

The Autism Behavior Checklist was completed for 67 autistic and 56 mentally retarded and learning-disabled children (ages 6-15). The checklist was effective in classifying children when using either the full scale or only the more highly weighted items. Results did not support a single unidimensional scale or subdividing the checklist into five…

This paper offers a rationale for and a description of the creation of the Developmentally Delayed Children's Behaviour Checklist, which is completed by caregivers or teachers and uses a taxonometric model to describe the child's (ages 4-20) disturbed emotions and behaviors. Results of clinical validation studies are cited. (Author/JDD)

This third volume of the Assessment, Evaluation and Programming System for Infants and Children (AEPS) describes AEPS measurement components for children who are at risk or who have disabilities, from 3 to 6 years of age. Section 1 provides a comprehensive description of the AEPS and how its measurement system functions for children and…