This study aimed to extract the psychometric properties of a Jordanian version of the Parents Evaluation of Developmental Status: Developmental Milestones (PEDS:DM) to present a psycho-metrically reliable Arabic scale that benefits the Jordanian context as an effective childhood intervention scale. The validity of the scale was achieved in three…

This study developed a test battery to assess the cognitive skills in children with physical limitations. A preliminary battery of 83 items was administered to 26 children, aged 26 to 36 months, with severe physical impairments. Rasch analysis yielded a final battery of 35 items with high internal consistency, interrater reliability, and…

The sequence of development as hypothesized by Piaget has been confirmed for various groups of children by cross-sectional and longitudinal studies. Such consistency has increased interest in constructing scales based on Piaget's theory according to psychometric principles. Three major problems are discussed which present definite obstacles in the…