Characteristics

• Graphical interface objects that represent task objects/functions, or objects in the user's work environment.
• Selection and manipulation of interface objects through pointing device.
• One or more metaphors presented, of which most interface objects form part.
• Operations on task objects is performed through "congruent" operations on the interface objects.
• All options are normally available at all times.

Important design requirements

• Consistent metaphor(s)
• Immediate feedback
• Icons should be clearly distinguishible through overall shape and color.
• The form of the interfaces objects (and the form of the mouse icon when hoovering above interfaces objects) indicate the operations that can be performed ("perceived affordance", "look and feel")