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Abstract. This paper explores how the user interface of a mobile device could support human perception and conception of changes in its environment. Animated transition effects may hold potential for visualizing changes in the resources available for the user through the context-aware user interface. Four different transition types are investigated. Each transition represents a different approach for visualizing changes in UI. The transitions are evaluated with 40 test subjects, half in India and half in Europe. Statistical analysis of the results indicates that animated transition effects have a clear positive effect on perception and conception of change.

Mobile communication technology has become an integral part of our everyday lives. Yet, do we recognize the patterns how we communicate with each other? In this paper we describe our work on increasing users' selfawareness of their communication with their social network with a mobile phone. We have developed two mobile phone applications, which log and visualize different elements of these patterns, enabling users to recognize the activity and responsiveness of their communication behavior more easily. We conducted a user study with 50 participants, where we compared the two applications and derived information of visualizing personal mobile communication patterns. Our research showed that although people were mostly well aware of the patterns of their social activity, still the majority of them found the applications interesting enough to view on a daily basis. We also report on findings on increased awareness of communication gaps, unexpected activity histories, and unbalanced communication behavior with incoming and outgoing calls/messages.