Both actor-network theory and activity theory call attention to the coexistence of people and technology. Although both theories provide analytical tools to understand the nature of the reciprocal action-shaping of humans and nonhumans, each puts emphasis on different conceptual elements of human activity. In this paper, the authors examine both activity theory and actor-network theory and present their similarities and differences, limitations, and complementarities. Using the theoretical

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... s of both theories, the authors trace the evolution of an ordinary artifact to illustrate how researchers on the sociology of technology and innovations can benefit from these parallel theoretical approaches.