the main dangers when carring out assessments is that children may be labelled eg bright or not capable,childrens development is not uniformly continuous,and many external factors can affect progress.once the child has been labelled adult eapectations can take over.once adults have a view of what children can do, there is a danger that they will focus on those things that the child does that reinforce this view.as well as being aware of the danger of labelling children,it is also important to rember that some observation methods are likely to change the childs natural behaviour.there are a variety of people involed in the assessment of children.engaging different perspectives is anthoer way of ensuring fair and objective assessment.
hope this helps