Page 74 - THE DUTCH TALKING TOUCH SCREEN QUESTIONNAIRE

Chapter 3 5.5.4.2 Consistent screen lay-out: Each screen should have the same functionalities and look the same. 5.5.4.3 Show only relevant items: Avoid unnecessary distracting functions, text, illustrations. 5.5.4.4 Clearly recognizable buttons: The buttons in the screen should be recognizable and big enough to be seen clearly on the screen. The form of the button should symbolize its function. The ‘forward-function’ should be in the form of an arrow that points ‘the next screen’. 5.5.4.5 Limited number of items to choose from: Not more than three items (for example photographs) should be shown on a screen at the same time. If more options are available, add a scroll function to show the remaining items. 5.5.4.6 One question per screen: Show only one question per screen. 5.5.4.7 Feedback: When a button is activated it should be accentuated. 5.5.5 Navigation 5.5.5.1 Not too long: Make the questionnaire as short as possible. 5.5.5.2 No progress indication: Do not use bookmarks, index or page numbers to indicate the progress. This adds to the pressure and distracts the user from the question. 5.5.5.3 No ‘back’ function: Do not use a ‘back’-function, because it gives users the feeling they could get lost within the questionnaire. Users just want to be able to go forward. 5.5.5.4 Provide overviews: Add regular overviews so that mistakes in answering are identified at an early stage, and allow correction. An overview could consist of pictures and images selected earlier. In this way, a back function is not 72