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WIZARD-OF-OZ (WoZ) TESTING
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We use rapidly programmed prototypes to gauge the degree of user-friendliness, the ease and effectiveness of use of the service (usability tests) before it is fully developed. We can, however, organise Wizard-of-Oz tests (WoZ tests) as well, even before a prototype has been created, in order to quickly estimate the effectiveness of the initial VUI vision (which - as a result - may necessitate a modification of the design).In both cases, we use purposefully selected user groups that are representative of your different target market segments and various types of end-customer: in terms of age, social class, education level, and level of familiarity with computers, technology and IVR applications.
The goal is to have the resulting system speak and communicate with each user group in the most appropriate for them manner: so the system diction should be different in the case of a 16-year-old smartphone expert user and different when the caller is a 70-year-old who hasn't ever touched a mobile phone. In the former case, language will probably include slang words and technical terms, whereas in the latter case, language will be more formal, and simplified terms will be used at all times.
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