Multi-level interaction for the exploration of rich information space

In this article, we discuss the visualization and interaction paradigms based on the Overview + Detail and Focus + Context mechanisms to support the exploration of rich information spaces, i.e. heterogeneous and multidimensional. We identify a set of levels of detail of the information, ranging from the information universe, until finest level corresponding to the data themselves. Each level is oriented toward a specific goal, deployed on an appropriate device class and operated through specific interaction techniques.