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The rise of Ajax and rich internet applications has thrown the limitations of traditional wireframing into painful relief. When you leave the world of page-based interactions, how do you document all but the simplest interactions? Flowcharts and diagrams don’t work. Prototyping saves the day by focusing on the application and conveying its "magic." Prototypes can help you sell a decision that is fundamentally or radically different from the client’s current solution or application. Sit a stakeholder down in front of a working prototype and show him or her why your approach is compelling.