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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. Wiley, Society for Research in Child Development are collaborating with JSTOR to digitize, preserve and extend access to Child Development This content downloaded from 144.32.128.70 on Mon, 13 Jun 2016 01:54:35 UTC All use subject to http://about.jstor.org/terms standing how individuals' cognitive abilities re-Preparation of this paper and the research reported here were supported by a grant from the Spencer Foundation to the first author. We are indebted to Maya Hickmann and C. Addison Stone for their helpful comments on an earlier draft of this paper and to Phyllis Schneider for her assistance in data collection. Request for reprints should be sent to James V. Wertsch,

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