Human-Computer Interaction (HCI) techniques are important in visualization because a good combination of them can help users to design a good visualization system while optimizing its visualization effects. In order to incorporate different HCI techniques to work together to achieve the synergy effects for optimizing graphical scalable visualization, three of them, i.e. goal, task and scenario analyses, are applied to an XML visualization system1 which has just been recently developed last year. The order of applying these HCI techniques will be researched upon. The recognition of patterns and models in a visualization system1 is important because this affects the efficiency of visual queries to be processed by the intended viewer. Singular...