Visualization Question:

☛ List and give examples of the Wehrend & Lewis eleven basic actions in visualization environments?
☛ Can give few examples of applications which allow zooming while maintaining context?
☛ What are the fundamental problems faced by the applications providing zooming capabilities?
☛ Pour some light over pre-attentive processing?
☛ What are the ways for solving problem of occlusion while drawing edges of a map or a graph?
☛ What is the main yet to be solved problem that always haunt people in the field of information visualization?
☛ What are the trends expected in the field of information visualization in near future?