During the construction of a spoken dialogue system much effort is spent on improving the quality of speech recognition as possible. However, even if an application perfectly recognizes the input, its understanding may be far from what the user originally meant. The user should be informed about what the system actually understood so that an error will not have a negative impact in the later stages of the dialogue. One important aspect that this work tries to address is the effect of presenting the systems understanding during interaction with users. We argue that for specific kinds of applications its important to confirm the understanding of the system before obtaining the output. In this way the user can avoid misconceptions and problems occurring in the dialogue flow and he can enhance his confidence in the system. Nevertheless this has an impact on the interaction, as the mental workload increases, and the users behavior may adapt to the systems coverage. We focus on two applications that implement the notion of rephrasing users input in a different way. Our study took place among 14 subjects that used both systems on a Nokia N810 Internet Tablet.