This book offers a critical reconstruction of the fundamental ideas and methods of artificial intelligence research. Through close attention to the metaphors of artificial intelligence and their consequences for the field's patterns of success and failure, it argues for a reorientation of the field away from thought in the head and towards activity in the world. By considering computational ideas in a large, philosophical framework, the author eases critical dialogue between technology and the social sciences. AI can benefit from an understanding of the field in relation to human nature, and in return, it offers a powerful mode of investigation into the practicalities of physical realization.

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Research on the Internet's role in politics has struggled to transcend technological determinism-the assumption, often inadvertent, that the technology simply imprints its own logic on social relationships. An alternative approach traces the ways, often numerous, in which an institution's participants appropriate the technology in the service of goals, strategies, and relationships that the institution has already organized. This amplification model can be applied in analyzing the Internet's role in politics. After critically surveying a list of widely held views on the matter, this paper illustrates how the amplification model might be applied to concrete problems. These include the development of social networks and ways that technology is used to bind people together into a polity.

We argue that the analysis of agent/environment interactions should be extended to include the conventions and invariants maintained by agents throughout their activity. We refer to this thicker notion of environment as a lifeworld and present a partial set of formal tools for describing structures of lifeworlds and the ways in which they computationally simplify activity. As one speci c example, we apply the tools to the analysis of the Toast system and show how versions of the system with very di erent control structures in fact implement a common control structure together with di erent conventions for encoding task state in the positions or states of objects in the environment.

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