The top unresolved problems in visualization were investigated by panelists from both the information and scientific visualization domains. One of the key unresolved challenges in visualization is collaboration in its broadest sense. Visualization 'scientists' need to spend more time understanding the underlying science applications in order to create effective visual representations. In order to 'evolve' visualization into a more scientific enquiry, visualization scientists need to understand and use the scientific method such as formulation of an hypothesis to explain the phenomena. Effective human computer interaction continues to be one of the top research and development goals for both visualization and computer graphics.