Question
a.
Because the desktop metaphor does not support move operations.
b.
Because the user is prevented from making any errors during drag-and-drop operations.
c.
Because direct manipulation interfaces use complex algorithms to avoid errors.
d.
Because drag-and-drop actions inherently create syntactically correct commands.
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Q. Why is it impossible to formulate a syntactically incorrect move operation in the pick-up-and-drag style of command in the direct manipulation interface?
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