Undo in Context-Aware Collaborative Ubiquitous-Computing Environment

A comprehensive approach to the design of Ubiquitous Computing systems must deal with the issues related to the restoration of an earlier or acceptable state of the system, if possible, when users intentionally want to undo some previous actions. Systems supporting collaborative Ubiquitous Computing environments should provide a default undo function, but also provide users and applications with awareness information to correctly decide which (compensative) actions should be undertaken. In this paper we describe how to achieve undo in distributed, dynamic, context-aware systems. We present a general approach to undo in collaborative Ubiquitous Computing environments in terms of the CASMAS model: part of the approach relies on the notion of active coordination artifacts, as defined also in CSCW literature. © 2008 Springer-Verlag Berlin Heidelberg.