Today• EvaluationEvaluation• Depending of the phase of the project– Walk-throughs and paper based interface (I)– Simulation of the interface and Wizard of Oz approaches (II)– Larger and larger group of users using the real interface (III)– Product is shipping (IV)• Monitor the support line(I) (II) (III) (IV)Low fidelity prototypes• Paper/plastic based interface simulation– Using sketches, foamcore, transparency, and PICTIVE* • Mode of operation*Plastic Interface for Collaborative Technology Initiatives through Video Exploration” Muller, CHI 91Paper prototyping (Carolyn Snyder)User “Computer”Observer(or video camera)InterfaceInterface elementsLow fidelity prototypes (summary)• Inexpensive• High level feedback about the dynamic of the interface• Trigger users reactions– Debrief users• Might be inaccurate– Speed, human-human interferences…Medium fidelity prototypes (II and III)• Using prototyping tools (Flash, Director, JavaScript,…)– Vertical prototype: Provide answer about a specific question • Is dialog box design A faster than dialog box design B?– Horizontal prototype: the full interface without the functionality• Is the command structure OK?– ScenarioWizard of Oz (I, II, III)• Testing a system that does not exist– Voice recognition, face identification, handwriting recognition• Mode of operation– Users use the interface as intended– A wizard (sometime hidden) responds to users behavior• Follow an algorithm• Reproduce the expected capability of the system– Example: the on-cart assistant in the IDEO videoMedium fidelity prototypes (Summary)• Time consuming• Be careful about user expectations– Developer might resist change– Management might think it is real• Do not get distracted by too small a detail– Color, font,…High fidelity prototypes• Piecewise prototype– Horizontal, vertical, scenario– Controlled setting• Alpha and Beta releases– Small scale distribution• Quicken• Final product?– Monitor help line– Monitor sell rep.• Costly– Problem can be deeply rooted in the software
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