Actor-Network Theory

Actor-network theory, often abbreviated as ANT, is a distinctive approach to social theory and research which originated in the field of science studies. Although it is best known for its controversial insistence on the agency of nonhumans, ANT is also associated with forceful critiques of conventional and critical sociology.
Developed by Science and Technology Studies (STS) scholars Michel Callon and Bruno Latour, the British sociologist John Law, and others, it can more technically be described as a 'material-semiotic' method. This means that it maps relations that are simultaneously material (between things) and 'semiotic' (between concepts). It assumes that many relations are both material and 'semiotic' (e.g. the interactions in a bank involve both people and their ideas, and technologies. Together these form a single network).
Actor-network theory tries to explain how material-semiotic networks come together to act as a whole (e.g. a bank is both a network and an actor that hangs together, and for certain purposes acts as a single entity). As a part of this it may look at explicit strategies for relating different elements together into a network so that they form an apparently coherent whole.
According to actor-network theory, such actor-networks are potentially transient, existing in a constant making and re-making [1]. This means that relations need to be repeatedly 'performed' or the network will dissolve. (E.g. the bank clerks need to come to work each day, and the computers need to keep on running.) They also assume that networks of relations are not intrinsically coherent, and may indeed contain conflicts (e.g. there may be poor labor relations, or computer software may be incompatible).