This paper includes a nontechnical description of methods for calculating effect sizes in intellectual and developmental disability studies. Different hypothetical studies are used to illustrate how null hypothesis significance testing (NHST) and effect size findings can result in quite different outcomes and therefore conflicting results. Whereas…

Background: Positive self-concept is an important educational outcome for individuals with disability. Method: Perceived competence and acceptance of 17 children with intellectual disability, included in mainstream classes, were assessed using the Pictorial Scale of Perceived Competence and Social Acceptance for Young Children (PSPCSA) and…

Background: Observational measures of parent and child behaviours have a long history in child psychiatric and psychological intervention research, including the field of autism and developmental disability. We describe the development of the Standardised Observational Analogue Procedure (SOAP) for the assessment of parent-child behaviour before…

Background: Families of young children with disabilities are faced with ongoing challenges that impact various aspects of family life. Given the increasing emphasis on promoting positive outcomes in these families, the overall aim of the current study was to examine the contribution of child, family, and support characteristics to the quality of…

Background: The EarlyBird program is a psycho-educational early intervention program for parents of children with autistic spectrum disorder (ASD). It aims to provide parents with skills to increase their child's communication and manage challenging behaviour using behavioural techniques. Method: Two interlinked studies examined access to the…

Background: The purpose of this study was to revise and validate the "Individual Child Engagement Record" (ICER), an instrument designed to observe and measure the engagement of children with disabilities in early childhood settings. Method: The ICER was revised with reference to pilot study results and the literature. Inter-observer reliability…

Background: It is generally assumed that children with Down syndrome (DS) present a deficit in lexical production relative to their cognitive abilities. However, the literature on this topic has recently shown several contradictory results. In addition, most studies only consider vocabulary production in its vocal modality. However it is also…

Background: The purpose of this study was to develop a measure of engagement that could be used in practice with children with disabilities, including children with severe intellectual disabilities. Method: The "Individual Child Engagement Record" (ICER) was designed to observe and record the engagement of individual children in order to identify…

Background: We investigated the play behaviours of children with autism. Cognitive and social levels of play engaged in by 4- to 8-year-old children with autism spectrum disorders were examined in naturalistic classroom settings. In addition, play at home was compared with play at school via mother and educator questionnaires. Method: Seventeen…

The present study investigated the relationship between behaviours exhibited by children with pervasive developmental disorders, particularly autism, and maternal stress levels. Participants consisted of 60 mothers who had a child diagnosed with a pervasive developmental disorder by an independent practitioner using DSM-IV criteria. Children were…

We evaluated the Developmental Behaviour Checklist (DBC) in the assessment of psychopathology in a Finnish population of children with intellectual disability. Disruptive behaviour was more common in children with mild intellectual disability, and problems with social interaction and communication in those with moderate, severe or profound…

Despite a substantial conceptual literature demonstrating a significant relationship between helpgiving practices and personal control, there are relatively few empirical studies that have examined this relationship beyond a single cultural group, and few studies that have made use of more complex measures of empowerment. This study reports the…