Hopefully, the relative fidelity of this prototype and the ability for actual users to have a somewhat "real" interaction with it will allow us to gather some meaningful data on the important components of voice ordering and feedback. In this section, we present several screen shots from the prototype, but to truly appreciate its worth for usability testing, one needs to actually interact with it. Contact Doug (addresses below) for a demonstration.
Here, the interface is shown after the customer has completed a single order of a hamburger. Note that the layout and appearance of thie prototype are different from the sketches presented in Section 3.2. Appearance is not the focus of this prototype, however. Rather, we were trying to eliminate distractions in order to focus on ordering and feedback. Thus, the virtual employee is simply a stick figure. The menu is shown to the left, and again, is minimal, offering only three items. Instructions are constantly shown, so that the tester can refer to them whenever necessary.
Also, note that feedback is given in two forms. First, the item ordered (or cancelled) appears in the list of items ordered at the top left, and the cost is added to the total cost in the red box at the bottom. Secondly, the user's command (not exactly what was said) appears as text, along with a confirmation ("Got it") by the system.
This screen shot shows the interface at termination time, that is, after the customer has given one of the termination commands. Tax is calculated and added to the total price, and the system gives a message in both text and verbal form telling the user what to do next.