Abstract
Recent developments of the clinical interview and of the teaching experiment are described. Applications and extensions are discussed in the context of developing models of cognitive mechanisms in a constructivist framework. Purposes for which the clinical method has been adopted are described, and problems associated with it are discussed in relation to these purposes. A teaching experiment designed to reveal constructive mechanisms that children use in establishing knowledge of numeration and addition and subtraction is exemplified. Connections between these two methodologies are examined.

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