Invention is an important source of technology, and, to understand invention, one needs a model system or prototype. A candidate model system is the hand tool. Using the hand tool as an example, the authors present a systematic approach to invention, dealing with description, classification, and joining or integrating simpler forms. Heuristics for when to integrate are presented. Finally, the authors introduce a new way of thinking about hand tools: simple spatial transformations applied to an abstract element make possible the re-creation of a large number of tools. Mokyr (1990) has argued that invention is one of the principle sources of technological development. On the face of it, this is obvious but it has not always been so. Because the process of invention is mysterious, scholars have typically dealt with processes like diffusion that are more readily observed and understood. Although Mokyr goes a long way toward restoring the importance of invention to technology's origins, he does not provide any systematic framework for understanding it.No wonder why. Invention is a complex creative act. How can we understand it better? Other disciplines approach their complexity through the study of a model system. Just as genetics has its fruit fly or Drosophila and medical research its laboratory mouse and tissue culture, so we need a model system or prototype to study invention (Weber 1989(Weber , 1992Weber and Dixon 1989; AUTHORS' NOTE: We wish to thank Linnda Caporael and an anonymous reviewer for their very helpful suggestions. Send reprint requests to Robert J. Weber,
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