... The results gathered supported, in all three instances, the null rather than the experimental hypothesis. Neither females, nor those with any siblings or specifically younger siblings had significantly better knowledge on developmental norms than the other conditions. However, despite not proving statistically significant, the results did show trends in the directions predicted in hypotheses 1 and 2. Introduction It is important to study development as without devising developmental 'norms' (i.e. a universally accepted 'normal' age for a child to be able to complete a particular task) children with developmental disorders such as autism or learning difficulties would not be diagnosed until much later on in life. Additionally it helps put parents' minds at rest knowing that they're child is progressing at the correct speed and will be able to identify the further help required if this is not the case. Therefore ways of testing children in order to ...

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