Five aspects of the psychological assessment of children are considered. First, the hypotheses of assessment are examined, with attention to the role of the scientist-clinician, the nature and the social and personal determinants of development, and the ego as the object assessment. Second, methods of data collection are surveyed, including…

Down Syndrome children (N=229), aged 1-83 months, from Australia, Canada, and Germany were tested using the Bayley Scales of Infant Development. Test performances on the Bayley's Mental and Motor scales were not dissimilar, leading to the conclusion that young Down Syndrome children from different countries with relatively comparable standards of…