In terms of human growth and development, PILES (now PILESS) is an anagram for Physical, Intellectual, Lingual, Emotional, Social (and Spiritual) Development. By looking at an individual in terms of these areas, it becomes easier to observe and understand behaviours. As an extreme example, a physically small child might be introverted because of feeling overwhelmed in a large group situation, or it may be extroverted as a defense mechanism.
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