The disparate performances on different information visualization interfaces in children with the same levels of ability is worth further discussion, especially as it pertains to their visual operation procedures and cross-memory operations. The purpose of an overview is to elevate the user from a 2D (egocentric) to a 3D (exocentric) view,allowing them to observe the structure of the information space and the placement of the icons that represent the information nodes. We discovered that improving operation of information visualization interfaces is a gradual process; participants improve then regress, and competency is built step by step. An overview is a dynamic procedure that requires the cross-operation of spatial perception and memory. Human beings rely on different types of intuition when they are faced with different interface features (survey,or route); some like to approach new information from a broad perspective (VZ3) while others like to approach from a micro-perspective (MV1).