  Determining and identifying opportune moments for interruptions is a
challenging task in Ubiquitous Computing and Human-Computer-Interaction. The
current state-of-the-art approaches do this by identifying breakpoints either
in user tasks, activities or by processing social relationships and contents of
interruptions. However, from a psychological perspective, not all of these
breakpoints represent opportune moments for interruptions. In this paper, we
propose a new concept in the field of interruptibility. The concept is based on
role theory and psychological interruption research. In particular, we argue
that social roles which define sets of norms, expectations, rules and
behaviours can provide useful information about the user's current context that
can be used to enhance interruption management systems. Based on this concept,
we propose a prototype system architecture that uses social roles to detect
opportune moments for interruptions.
