This text is a collection of research which provides readers a window into the behavioural variability exhibited by persons with Down's Syndrome. With this resource researchers, educators, parents and students should gain an increased understanding that perceptual-motor behaviour in Down's Syndrome is often adaptive and appropriate - a result of environmental experience and development. The ultimate goal is to circumvent, or at least minimize, some of the general and specific processing challenges associated with Down's Syndrome. Contributors from 10 countries cover aspects of sensory, cognitive and movement processes in infants, children and adults with Down's Syndrome. Specifically addressed are the differences and similarities among persons with Down's Syndrome, people with other disabilities and non-disabled people.