This article is concerned with the digitisation of border security and migration management. Illustrated through an encounter between a migrant and the Visa Information System (VIS)-one of the largest migration-related biometric databases worldwide-the article's first part outlines three implications of digitisation. We argue that the VIS assembles a set of previously unconnected state authorities into a group of end users who enact border security and migration management through the gathering, processing and sharing of data; facilitates the practice of traceability, understood as a rationality of mobility control; and has restrictive effects on migrants' capacity to manoeuvre and resist control. Given these implications, the article's second part introduces three analytical sensitivities that help to avoid some analytical traps when studying digitisation processes. These sensitivities take their cue from insights and concepts in science and technology studies (STS), specifically material semiotics/Actor Network Theory (ANT) approaches. They concern, firstly, the ways that data-based security practices perform the identities of the individuals that they target; secondly, the need to consider possible practices of subversion by migrants to avoid control-biased analyses; and finally, the challenge to study the design and development of border security technologies without falling into either technological or socio-political determinism.

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This article explores the maintenance of large-scale information systems that are used for, among other purposes, border security in the European Union. My argument is that information systems do not always operate according to their design scripts. They materialize as unruly, unstable and failing infrastructures that are governed through maintenance in order to correct any identified functional anomalies and address potential future failures by adapting them to emerging technologies and the service needs of end-users (e.g. border guards, police). To conceptualize the maintenance labour through which information systems are governed, I synthesize ideas developed in Michel Foucault’s work on biopolitics and governmentality with contributions that explore the agentic forces and proclivities of technoscientific matter. By unearthing the very mechanics of maintenance processes, I make two contributions to the literature that interrogates the digitization and smartening of border security. First, I demonstrate that attending to maintenance permits a more complete understanding of the agency of information systems. Second, I broaden the research agenda that explores border security as practice by directing attention towards the often invisible, but politically significant, labour of maintainers who, by rendering information systems functional, sustain the power to govern international mobility by digital means.

This article focuses on the Schengen Information System (SIS II) -the largest data infrastructure supporting police cooperation and border controls in the European Union. Through the SIS II, national authorities exchange information about individuals and objects, and this across national and institutional boundaries. Yet, the SIS II does not always perform as anticipated in its design scripts. Following common threads about infrastructural politics across Science and Technology Studies, political geography and critical security studies, we explore fragility and maintenance as being intrinsic to the functioning of data infrastructures and crucial sites of governance. We show how the SIS II is kept under continuous control to operate as a controlling data infrastructure. This article contributes to a critical inquiry into the datafication of border controls by interrogating how data acquire the status of allegedly credible and accurate information. Ultimately, this approach pinpoints the inherent fragility of seemingly mighty data infrastructures and casts a light on those actors and processes that sustain, through maintenance, contemporary digital borders.

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