Thesis - Teknisk Design

Figure 4.2 Notional learning curve, adapted from Jordan (1998)Components for the studyRegarding the actual project, there is a wide range of users; everyday users who usethe car to commute, weekend user who use the car to go outside the city the nonworkingdays and finally, sporadic user who use the car once in a while. Anotherthing that has to be taken into consideration is the usage of the different functions ofthe touch screen. Even if a user takes the car every day, he or she might not use thetouch screen, so it makes him or her a sporadic user for the touch screen. Moreover,if the user uses the touch screen but there is a function that is used from time to time,this user is a sporadic user for this specific function.All this means that there are a lot of different users for this device so everycomponent of usability should be considered. Due to time and resource limitationsthis project will just take two into consideration, even though the reasons why theothers are not involved in this study will be discussed.GUESSABILITYGuessability is an interesting component to take into consideration from the point ofview that a user could turn off the haptic feedback if the received information fromthis stream is not enough guessable.To follow usability guides it is important to have the possibility to adapt aproduct to the user desires (Jordan, P. W. 1998), in this case it means to makepossible for the user to turn off the haptic feedback or just to be able to have astronger or a lighter feedback. This fact must be seen as strength of the product as atouch screen but for the purpose of the project, looking to the benefits hapticfeedback could give to a driver using in-vehicle touch screen, it is a threat. What ifthe user turns off haptic feedback at the beginning because he or she does not feelcomfortable with it and miss the possible benefits it might bring to him or her in thefuture?50