 It shows each part of the system, how it supports the user's work, exactly what function is available in that part, and how the user gets to and from other parts of the system.Contextual design uses the User Environment Design (UED) diagram, which displays the focus areas, i.e., areas which are visible to the user or which are relevant to the user.Focus areas can be defined further as functions in a system that support a certain type or part of the work.