Susanne Bay

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The current study was concerned with the basic question of how to overcome users' disorientation when navigating through hierarchical menus in small-screen technical devices, as for example mobile phones. In these devices, menu functions are typically organized in a tree structure. Two different navigation aids were implemented into a computer simulation of(More)
The interrelationship between mental models of a cellular phone menu and performance depending on users' age was under study. The mental representation was assessed through card-sorting technique in 32 novice users (16 aged 20-32, 16 50-64 years). First, they had to process four common tasks on two simulated mobiles enabling online logging of users'(More)
Differences in cellular phones' complexity and their impact on children's performance are under study in this experiment. Twenty children (age 9-14 years) solved tasks on two phones that were simulated according to existing models on a PC with a touch screen, holding constant display size, fonts, and colors. Actions were logged and analyzed regarding(More)
The present study investigates the impact of different key solutions of mobile phones on users' effectiveness and efficiency using the devices. In the first experiment, 36 children (9 – 14 years) and in the second experiment 45 young adults (19 – 33 years) completed four common phone tasks twice consecutively on three simulated phones that had identical(More)
This paper focuses on the impact of users' mental model for the performance when interacting with mobile devices. Investigating the interrelation between the quality of the mental model and the performance, users had to accomplish standard applications with cell phones (study 1) and a PDA (study 2). Navigation routes were individually analyzed and the(More)
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