How can we measure and quantify the quality of a visualization? In which way do methods in the data space differ from methods in the image space?
How can we compare the measured quality of a visualization with the perception of a human?
How can the user be involved into a quality-metric-driven process of visual mappings and transformations?
What is the influence of perceptual effects on quality measures? Can we enhance the visual representation of information by introducing perceptual effects into visualizations?