The present study examined the relationships between the standardized applied behavior analysis (ABA) direct assessment, the PEAK Comprehensive Assessment (PCA), and established assessments commonly used in educational and clinical settings, including the Childhood Autism Rating Scale - Third Edition (CARS-3), the PDD Behavior Inventory (PDDBI),…

Behavior analysts frequently use the Verbal Behavior Milestones Assessment and Placement Program (VB-MAPP) to assess the language and social skills of children with autism in everyday practice and in research. Despite the widespread use of the VB-MAPP, its psychometric characteristics have not been extensively investigated. To provide information…

Background: The Nisonger Child Behavior Rating Form (NCBRF) allows for the assessment of frequency and severity of challenging behaviours of individuals with ID with one combined rating. However, frequency and severity rating of challenging behaviours may be in disagreement. Therefore, the efficacy of frequency and severity independent ratings for…

Background: In addition to symptoms of neurodevelopmental disorders, functional impairment is crucial to the determination of clinical significance. The aim of this study was to examine partial validity and usefulness of the Strengths and Difficulties Questionnaire's (SDQ) impact supplement (SDQ impact) in measuring functional impairment in…

We used parent-report data from a prospective longitudinal study to better understand the early strengths in written skills often observed in preschoolers on the spectrum. Consistent with previous research, children demonstrated relative strengths in standardized written communication compared to spoken communication scores on the VABS-II. We…

Social interaction difficulties in children with autism spectrum disorder can be challenging, especially during adolescence. In addition, high rates of comorbid internalizing disorders in autism spectrum disorder can lead to social isolation. With limited social activity participation, social deficits and internalizing problems in autism spectrum…

Background: Understanding adaptive behaviour variability in children with autism spectrum disorder (ASD) may have important implications for early intervention. The purpose of this study was to explore whether autism symptom severity and caregiver depression affected adaptive behaviour in young children with ASD. Method: Data were collected from…

Late language emergence (LLE) may result from genetic and environmental factors. Little is known about environmental factors in LLE in South Africa. The study describes the nature of differences in language functioning between toddlers with LLE and without LLE, and which factors were associated with LLE in a middle-income area in South Africa.…

This article presents a description of the Vineland Adaptive Behaviour Scales, Third Edition (Vineland-3; Sparrow, Cicchetti, & Saulnier, 2016), published by Pearson, which is a newly updated individually administered measure of adaptive functioning for individuals from birth to age 90. Primarily used in clinical, psychoeducational, and…

Rett Syndrome (RTT) is characterized by severe impairment in fine motor (FM) and expressive language (EL) function, making accurate evaluations of development difficult with standardized assessments. In this study, the administration and scoring of the Mullen Scales of Early Learning (MSEL) were adapted to eliminate the confounding effects of FM…

Preschool children with autism spectrum disorder (ASD) experience slower development of daily living skills (DLS) that are essential for independent functioning compared to typically developing children. Few studies have examined the trajectories of DLS in preschoolers with ASD and the existing literature has reported conflicting results. This…

Students with complex communication needs require well-designed supports to communicate effectively in school settings. Although paraprofessionals are often charged with supporting these students, they are rarely trained in how to promote communication, and there is limited research on how they might be trained. In this study, we used a multiple…

Introduction: People with intellectual disabilities and co-occurring psychopathology have a relatively high likelihood to engage in aggressive behavior. Nevertheless, structured clinical assessment of aggressive behavior, including when and where it occurs, is scarce in this population. Methods: On three wards specializing in the care for people…

Intelligence tests and adaptive behavior scales measure vital aspects of the multidimensional nature of human functioning. Assessment of each is a required component in the diagnosis or identification of intellectual disability, and both are frequently used conjointly in the assessment and identification of other developmental disabilities. The…

Individuals with autism spectrum disorder (ASD) tend to have significant delays in adaptive functioning. In this study, the relationship between adaptive behavior and ASD symptomatology was investigated in minimally verbal, school-aged children with ASD (n = 333). Both the social affect (SA) and restricted and repetitive behavior (RRB) domains…