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Development of the Dutch Talking Touch Screen Questionnaire DTTSQ (see Fig. 3.2) \[26\]. The essential characteristic of this method is that it involves users that belong to the target group (in this case low literate persons) of an envisioned product or service in all phases of the development process, and as early as possible. Starting from existing knowledge on man-machine interaction (MMI) theory, guidelines and methods and the envisioned technological design space (system and task demands), user interface specifications are drafted, evaluated and refined in iterative phases of development. The user-centered design method consists of three main phases: analysis, design and implementation. In the analysis phase, on the basis of characteristics of the users, their goals, their information and support needs and the use context, the functions of the system and the associated information are determined (user inter-face design at the task level). In the design phase, the operation of the functions and the information presentation are specified (user interface at the communication level). In the implementation phase, the user interface design is implemented. Figure 3.2 User-centered design: Man-machine interaction (MMI) theory, guidelines and methods, technological design space, system and task demands, iterative phases of development (analysis, design and implementation), user interface specifications (scenarios, storyboards, interaction specifications), MMI evaluation (focus group, user walkthrough, usability testing) and evaluation outcomes (effectiveness, efficiency, satisfaction, experience) 59 3