Technological Momentum
Technological momentum has been advanced by Thomas Hughes (1983, 1987, 1994) to account for the dual social and material nature of technology. Based on historical studies of electrical power systems and other large technical systems, Hughes rejects both technological and social determinism: "both approaches suffer from a failure to encompass the complexity of technological change" (Hughes 1994, 102). Instead, he suggests a cycle of mutual shaping in which social and material components are joined into complex, networked relationships. "Cultures of technology" grow up around certain technological systems and create momentum, "the propensity of technologies to develop along previously defined trajectories unless and until deflected by some powerful external force or hobbled by some internal inconsistency" (Constant 1987, 229).
Technological momentum is not singular or unidirectional, but diversified and open to contingency. It encompasses "acquired skill and knowledge, special-purpose machines and processes, enormous physical structures, and organizational bureaucracy" (Hughes 1994, 108). Successful engineers like Thomas Edison are "heterogeneous," working not only with "inanimate physical materials, but on and through people, texts, devices, city councils, architectures, economics and all the rest" (Law 1991, 9).
Hughes disagrees with Winner's concept of autonomous technology. "Technological systems, even after prolonged growth and consolidation, do not become autonomous; they acquire momentum. . . . Momentum does not contradict the doctrine of social construction of technology, and it does not support the erroneous belief in technological determinism" (Hughes 1987, 76, 80). Nonetheless, once technological systems become stabilized and acquire momentum, the artifacts generated by and enmeshed in those systems can exert influence, just as social action influences them. Remark- ing on the Muscle Shoals (later Wilson) Dam project built as part of the Tennessee Valley Authority, Hughes notes, "This durable artifact acted over time like a magnetic field, attracting plans and projects suited to its characteristics. Systems of artifacts are not neutral forces; they tend to shape the environment in particular ways" (Hughes 1994, 111).
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Actor Networks
Perhaps the best-known approach to technology studies among researchers outside STS is associated with Michel Callon, Bruno Latour, John Law, and their colleagues (Latour 2005; Law and Hassard 1999). Actor-network theory (ANT) maps relationships among material entities and artifacts, human actors, and the ideas or symbols associated with them as "heterogeneous" and open sociotechnical networks. Human actors and material artifacts or actants are nodes in interlinked webs of relations, with the ability to exert multiplex influence on other relationships and nodes in the network. The actor-network perspective resists the "purification" of issues or practices into singular categories like nature, science, politics, culture, or even place: all these categories, and more, are necessarily and simultaneously implicated in a given network (Latour 1993). The insistence on heterogeneity, especially the idea that material artifacts and objects can be agents within networks of relations among humans and knowledge, is perhaps the most controversial aspect of ANT, and most firmly places the materiality of things at the center of the theory.
As with social networks among people, relationships among nodes within actor networks are continuously reconstituted by the agents themselves. These dynamic relationships enable technological systems to evolve, stabilize, break down, or reorganize in new and unexpected ways. Taking their cue from Hughes, ANT scholars have examined large or intricate technical systems (see Callon 1986, 1999; Latour 1996; Law 1987; Mol 2002), and count heterogeneity, networks, and the systems perspective as impor- tant influences (Law 1987).
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Co-Production
A fourth concept not only suggests that science and technology are simultaneously material and social, but also aims to elaborate the dynamics of the relationship, especially as a means for confronting authority and intervening in technological controversies and policy. According to Sheila Jasanoff, its most notable proponent, co-production is the simultaneous creation of knowledge and artifacts/practices, which actually constitutes social life: "the ways in which we know and represent the world (both nature and society) are inseparable from the ways in which we choose to live in it. Knowledge and its material embodiments are at once products of social work and constitutive of forms of social life" (Jasanoff 2004, 2).
In co-production, knowledge is fundamentally material: "Knowledge . . . crystalliz[es] in certain ontological states—organizational, material, embodied—that become objects of study in their own right" (Jasanoff 2004, 3). In some ways, co-production echoes Winner's contention that artifacts manifest the values and assumptions (that is, knowledge) of their creators, but extends this insight to social practices and organizational forms. And like autonomous technology, co-production is concerned with the practical governance of science and technology (Irwin 2008). It rematerializes power, so that it is no longer an abstract "force" or institutional "structure," but is actually instantiated and observable in the physical forms of social practices, relations, and material objects and artifacts. <...>
Jasanoff suggests that co-production can be found in four "sites" or processes: making identities, making institutions, making discourses, and making representations. In the social sciences, cultural studies, and the humanities, these phenomena are often treated as abstract concepts that are independent of their particular manifestations or physical forms. Jasanoff, however, insists that such material forms actually constitute identity, institutions, discourses, and representations. Identity, for example, is mani- fested in modes of dress, speech, food, kinship relationships, and so on. Discourses are articulated in political campaigns, architecture, publishing, conversation, stock prices, or monthly bills for Internet services. Institutions exist in the form of legal codes, educational practices, configurations of space, or social roles. Representations convert concepts into concrete form, as when terrorism is equated with an image of a hooded street fighter, or genetically modified crops are labeled "Frankenfood." In each case the physical forms and objects constitute the ideas in question; such manifestations can be parsed and analyzed, and new ones crafted as needed.