Worker: User-Interface
Designer
The user-interface designer leads and coordinates the prototyping and design of the
user interface, by:
- capturing requirements on the user interface, including usability requirements;
- building user-interface prototypes;
- involving other stakeholders of the user interface, such as end-users, in usability
reviews and use testing sessions;
- reviewing and providing the appropriate feedback on the final implementation of the user
interface (as created by other developers, i.e. designers and implementers).

Staffing 
The user-interface designer should not implement the user interface. Instead, a
user-interface designer should focus and devote time only on the design and the
"visual shaping" of the user interface, because:
- The skills required by a user-interface designer often need to be improved and optimized
for the current project and application type (with potentially unique usability
requirements)-this requires time and focus.
- The risk of "mixed allegiances" should be delimited, that is, the
user-interface designer should not become too influenced by implementation considerations
(as opposed to usability considerations).
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