The best type of personality measure that would be the most useful in collecting data about a 3 year old child is an informant report.
An informant report can be described as a report about a person where by another person who acts as an observer reports what he or she notices.
A child of three would be unable to provide details about her personality from the inside. But an informant would be able to provide these details using an outside view of what he or she observes with the child.
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