Use Wizard of Oz technique to build and test a behavioral prototype for an application of a voice-operated assistant.
WIZARD OF OZ
Wizard of Oz prototyping is a method where designers create a model of a product using every-day objects to represent parts of the finished product that is capable of performing some of the tasks. Designers use role playing to test how end users will interact with the product.
VOCA: Voice Operated Cooking Assistant
Similar to Amazon's Alexa, VOCA uses voice commands to process feedback for searching recipes and providing cooking instructions. Our prototype (as shown below) is made of 2 components--a cardboard cylinder wrapped in gold paper that hides the bluetooth speaker which projects audio. To activate the bluetooth speaker, we activate and connect a phone call to the bluetooth speaker. We hide one phone close to the bluetooth speaker and the caller hides in a nearby room to "role play" as VOCA.
We presented our participant with a task and a list of commands to activate VOCA. Our intent with user testing was to evaluate the effectiveness of VOCA by answering the following research questions:
Task: You are craving sweets and feel like making Nutella cookies. Please use VOCA to assist you in the baking process.
Commands activated by "VOCA...":
Overall, VOCA was a success. Our participant described VOCA as simple and intuitive. But more importantly, they were able to successfully produce cookies by using VOCA's instructions. However, the act of using Wizard of Oz techniques wasn't as effective because there were mishaps such as mispronouncing words and technical issues that revealed the wizard.
In addition to our observations, we received the following feedback from peers in a class demo critique: