Obligatory passage point
Encyclopedia
The concept of Obligatory passage point (OPP) was developed by sociologist Michel Callon
Michel Callon
Michel Callon is a Professor of Sociology at the Ecole des Mines de Paris and member of the Centre de Sociologie de l'Innovation. He is an influential author in the field of Science and Technology Studies and one of the leading proponents of Actor-network theory with Bruno Latour.In recent years ,...

 in a seminal contribution to Actor-network theory
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...

: Callon, Michel (1986), "Elements of a sociology of translation: Domestication of the Scallops and the Fishermen of St Brieuc Bay". In John Law
John Law (sociologist)
John Law is a sociologist currently on the Faculty of Social Sciences at the Open University and key proponent of Actor-network theory. Actor-network theory, sometimes abbreviated to ANT, is a social science approach for describing and explaining social, organisational, scientific and technological...

 (Ed.), Power, Action and Belief: A New Sociology of Knowledge? London, Routledge: 196-233.

Obligatory passage points are a feature of actor-networks, usually associated with the initial (problematization) phase of a translation process. An OPP can be thought of as the narrow end of a funnel, that forces the actors to converge on a certain topic, purpose or question. The OPP thereby becomes a necessary element for the formation of a network and an action program. The OPP thereby mediates all interactions between actors in a network and defines the action program. Obligatory passage points allow for local networks to set up negotiation spaces that allow them a degree of autonomy from the global network of involved actors.

An action program can comprise a number of different OPP's. An OPP can also be redefined as the problematization phase is revisited.

In Callon and Law's
John Law (sociologist)
John Law is a sociologist currently on the Faculty of Social Sciences at the Open University and key proponent of Actor-network theory. Actor-network theory, sometimes abbreviated to ANT, is a social science approach for describing and explaining social, organisational, scientific and technological...

'"Engineering and Sociology in a Military Aircraft Project" the project management of a project to design a new strategic jet fighter for the British Military became an obligatory passage point between representatives of government and aerospace engineers.
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