TOWARD AN INFORMATION VISUALIZATION WORKSPACE - COMBINING MULTIPLE MEANS OF EXPRESSION

New user interface challenges are arising because people need to explo re and perform many diverse tasks involving large quantities of abstra ct information. Visualizing information is one approach to these chall enges. But visualization must involve much more than just enabling peo ple to ''see'' information. People must also manipulate it to focus on what is relevant and reorganize it to create new information. They mu st also communicate and share information in collaborative settings an d act directly to perform their tasks based on this information. These goals suggest the need for information visualization workspaces with new interaction approaches. We present several systems-Visage, SAGE, a nd selective dynamic manipulation (SDM)-that comprise such a workspace and a suite of user interface techniques for creating and manipulatin g integrative visualizations. Our work in this area revealed the need for interfaces that enable people to communicate with systems in multi ple complementary ways. We discuss four dimensions for analyzing user interfaces that reveal the combination of design approaches needed for visualizations to support information analysis tasks effectively. We discuss the results of our attempts to provide multiple forms of expre ssion using direct manipulation and propose areas where multimodal tec hniques are likely to be more effective.