A major drawback of current gesture interaction solutions is the lack of support for two necessary user interface design principles, feedback and visibility (or affordance). Feedback notification is required to indicate whether the gesture has been entered correctly by indicating the gesture recognized and the corresponding command activated, although Sensiva does approach this to some extent in providing voice notification. The other principle is visibility of gestures, providing the user some means of learning the necessary gestures and the contexts they can be used in. Both Mouse Gestures for Internet Explorer and ALToolbar Mouse Gestures display colored tracers that indicate the current motion that the user is taking to facilitate visual clues for the user. Pie menus and marking menus have been proposed as solutions for both problems, since they support learning of the available options but can also be used with quick gestures. Most recent versions of Opera (11 and above) uses an on-screen pie menu to simply and instructively display which mouse gestures are available and how to activate them, providing feedback and visibility.
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