Abstract
This chapter presents the six experiments of Piaget that are adapted from the book The Child's Conception of Geometry. It presents an account of Piaget's investigation of the problems of measurement and metrical geometry, and by means of this investigation, to show the stages of development through which the child's concept progresses. The account of Piaget's experiments shows a progression of development through three or four stages from a complete faith in visual perception, through the evolution of hand and arm movements as an intermediate measure, to the use of a common measure that could finally be applied by the operation of unit iteration. The final stage of development of the concept he terms conservation, by which he means that length, area, or volume, etc. is unaltered by change of the position, or change in the order of the elements composing the whole.
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