Design and prototyping graphical user interfaces.
A study of an existing graphical user interface is undertaken through surveys of users, to gain insights about their behavior, their problems and wishes. In order to better understand the different user groups, personas are created. The functionalities of the application are then specified using different use cases. Wireframes define the basic framework of the interface. The graphical surface is then designed via wireframing. Subspaces are implemented prototypically to be used for a simple usability test.