George Vellis

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The paper reports on the design of a prototype system to facilitate intertwining of on-line and off-line practices during collaborative networked music master classes. Our approach links with recent theoretical thinking inspired from the concept of communities of practice and aims to devise a system to provide a virtual 'place' for engaging in the practice(More)
The paper describes an engineering approach for building user interfaces for synchronous peer co-engagement in virtual work by operating with, on, through and within different digital representations. The proposed approach introduces several extensions to the UsiXML family of models as well as design and runtime support for multi-platform, synchronous and(More)
— The paper describes an engineering method for building user interfaces for ubiquitous environments. The method comprises of several extensions in the UsiXML family of modes as well as design and runtime support so as to enable multi-platform, synchronous and collaborative interactions. We demonstrate key concepts of the method and their application by(More)
This paper is inspired by the concept of digital metamaterials and advances a proposal for a genre of digital artifacts that exhibit the transformative capacity to transcend technical boundaries in digital ecosystems. In terms of theoretical footing, our approach is ground on the conception of 'software as material' with intrinsic properties such as(More)
The paper presents a field study aimed at identifying and analyzing the role of boundary artifacts in cross-organization virtual communities of practice (CoP). Our analysis is informed by a recent case study in vacation package assembly (VPA), which is defined as the distributed collective practice carried out by members of a boundary-spanning virtual(More)
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