User requirements should provide the primary drive for the design of any system. Therefore, consider the user interface before any other components.
The user interface determines the appearance of the system desired by the user. It is composed of a number of displays, including screens, windows and dialog boxes.
Linking the displays using dialog flows will determine the behavior of the system.
After the users confirm the appearance and behavior of the user interface, the procedure logic can be fully developed.
In system structure design, you are only interested in those aspects of the user interface that influence the other components of the system. Aspects of the user interface that display only for the user can be left until layout design.
Consider the characteristics of all the intended users. The design of an online dialog should address all possible interactions users might have with the business system.
The following factors influence the final appearance of the dialog:
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