A case study in the development of a speech-based car cellular phone is presented. Specifically, the structure of human-machine speech dialogues was investigated in an iterative usability engineering process consisting of three phases. The first phase included a laboratory evaluation of an initial user interface design concept using a simple demonstration program. In the second phase, some recommendations were implemented in a partial prototype that included the speech recognition technology. This prototype went through a formal field usability test in real driving conditions. Finally, in the third phase, a fully operational product was again tested with human participants in driving conditions. Findings indicated that the iterative process was converging: less usability problems were reported in each phase. The implications of iterative usability engineering approaches in situations with changing underlying technology during the development of consumer products are discussed.

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Keywords Consumer product development, Human-centered design, Speech-based user interface, Usability engineering
Journal International Journal of Industrial Engineering : Theory Applications and Practice
Parush, A. (2004). Usability engineering case study of a speech-operated car phone. International Journal of Industrial Engineering : Theory Applications and Practice, 11(3), 221–230.