The main requirement of the GUI is that the entry of data into and the extraction of data from the database is as simple as possible, consistent with the flexibility of function as determined by the data model. Other less obvious but important factors are that the GUI must appear professional and relatively pleasing to the eye. It must be uncluttered, yet offer all the functionality required in a particular window. The need to jump from window to window to detail a single data set must be minimized. The overall operation should be as self-intuitive as possible.
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