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From Gramps
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* Data editors (like the Edit Person or Edit Family dialogs) should be just that - Data Editors. They are for data entry, not for displaying interesting information. If you want to display related data that is not part of the entry, use a Quick Report in the right context menu.
* Help the user. If a button is not valid in the current context, set it insensitive. That way the user doesn't click on it and wonder why nothing happens.
* Data should be edited in one place, and one place only. Otherwise, we cannot keep consistency. If two dialogs are editing the same data, one will stomp on the other's data.
* Too many options confuse users and make the program more work to maintain. Consider alternatives before adding a new option. Adding options should be the last resort, not the first.
* In the UI, display actual data, not derived data. If people see derived data in the UI, they will expect to be able to edit it. Derived data should only be shown in reports.
* Remember that the majority of the users are probably novices without a lot of computer experience. Design things so that your Aunt Martha could use it. Advanced functions can be deferred to the right context menu.
