Despite the large volume of research on uncertainty visualization, we do not fully understand the impact of uncertainty visualization on decision-making. There is evidence of both positive and negative effects of visually depicted uncertainty on decision-making.

This talk presents examples of evaluations carried out with practitioners in various application areas, including autonomous driving, air traffic risk assessment and maritime surveillance. I summarise the effects of the uncertainty visualizations provided on the users and their decision-making processes in these evaluations.

Finally, we discuss the need for a design theory/space of uncertainty visualization and elaborate on the multiple dimensions/variables that such a design space should have.