  In this paper, we present our design study on developing an interactive
visual firewall log analysis system in collaboration with an IT service
provider. We describe the human-centered design process, in which we
additionally considered hedonic qualities by including the usage of personas,
psychological need cards and interaction vocabulary. For the problem
characterization we especially focus on the demands of the two main clusters of
requirements: high-level overview and low-level analysis, represented by the
two defined personas, namely information security officer and network analyst.
This resulted in the prototype of a visual analysis system consisting of two
interlinked parts. One part addresses the needs for rather strategical tasks
while also fulfilling the need for an appealing appearance and interaction. The
other part rather addresses the requirements for operational tasks and aims to
provide a high level of flexibility. We describe our design journey, the
derived domain tasks and task abstractions as well as our visual design
decisions, and present our final prototypes based on a usage scenario. We also
report on our capstone event, where we conducted an observed experiment and
collected feedback from the information security officer. Finally, as a
reflection, we propose the extension of a widely used design study process with
a track for an additional focus on hedonic qualities.
