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In page Melanie Klein:

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Encouraged by Ferenczi, Klein began her studies by observing her own children.[2] During this time, there was little documentation on the topic of psychoanalysis in children. So, Klein took advantage of this by developing her "play technique". According to Klein, play is symbolic of unconscious material that can be interpreted and analyzed in the same way that dreams and free associations are in adults. Later, her research contributed to the development of play therapy.[citation needed]