This volume presents a selection of the contributions to the Seventh Workshop on Informatics and Psychology. The theme of the workshop was Visualization in Human-Computer Interaction. Visualization is nowadays recognized as an important aspect of user-oriented human-computer interfaces. Both informatics and psychology are concerned with this topic. In informatics, the technology is being developed which makes visualization and interaction based on visual concepts feasible. Another important trend in informatics is the development of prototypical solutions. Visual programming, visual languages, graphical interfaces, visual representations and many other keywords characterize current efforts in this field. Psychologists are working on the question of how people represent knowledge visually and how they can take advantage of visual representations when solving tasks.