One of the key challenges faced when developing context-aware
pervasive systems is to capture the set of inputs that we want
a system to adapt to. Arbitrarily specifying ranges of sensor values to
respond to will lead to incompleteness of the specification, and may also
result in conflicts, when multiple incompatible adaptations may be triggered
by a single user action. We posit that the ideal approach combines
the use of past traces of real, annotated context data with the ability for
a system designer or user to go in and interactively modify the specification
of the set of inputs a particular adaptation should be responsive
to. We introduce Situvis, an interactive visualisation tool we have developed
which assists users and developers of context-aware pervasive
systems by visually representing the conditions that need to be present
for a situation to be triggered in terms of the real-world context that is
being recorded, and allows the user to visually inspect these properties,
evaluate their correctness, and change them as required. This tool provides
the means to understand the scope of any adaptation defined in
the system, and intuitively resolve conflicts inherent in the specification.