The major problem for a theory of development is to explain how to get something more from something less.
Smith, L. B., & Thelen, E. (2003). Development as a dynamic system. TRENDS in Cognitive Sciences, 7, 8, 343-348.

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The major problem for a theory of development is to explain how to get something more from something less.
Smith, L. B., & Thelen, E. (2003). Development as a dynamic system. TRENDS in Cognitive Sciences, 7, 8, 343-348.