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In this paper, we regard the coordination of spatial perspectives as the transformation-operations of coordinate system between the child's own viewpoint and the other's one. In order to clarify the developmental feature of transformation-patterns, the 6-10 years children were tested in Experiment I under three conditions: Perspective, plotting, and movement. In Experiment II, the consistency of transformation-patterns was examined. Main results were as follows: (1) Under the perspective condition, most of six years-children did not make any egocentric errors. (2) Some consistent transformation-patterns were identified in children's error's. (3) Both identification of the origin and right understanding of the transformation rules were recognized as essential bases for the coordination of perspectives.

Development of transformation ability of coordinate system in spatial representation.