Stable Point of View


Illustration, Point of View and Action


Users want ongoing feedback about the status of the assembly.


How to provide the user with feedback on the state of the assembly.


  • During the assembly task users look for ongoing feedback about the status of their assembly.
  • Users may have low Spatial Visualisation Ability making it difficult to compare and interpret different views of the same object.
  • When the point-of-view changes this alters the information provided in addition to the changes associated with the assembly tasks. Thus the user needs to compare images according to the change in the point-of-view and the assembly operation adding to the information to be managed in order to interpret the images.


The representation of the assembly is ideally presented from a fixed point-of-view and fixed scale for as many steps as possible to assist with comparing before and after (Action/State) images.


Heiser & Tversky, (2003)

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Related Patterns:


Action / State

Images are easier to compare if the point-of –view is static.

See Everything

The entire object should be predicted to provide contextual information, this can impact on the chosen point-of-view.

Discernable Details

When deciding in a suitable point of view it is important these views include sufficient details for the user to identify and orient parts.


Realistic Arrangements

This may require the point-of-view to change so the assembly is depicted in a realistic position.

Viewing angle

There is a preference for iconic views, this can conflict with a point-of-view suitable for a number of steps.


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