• Publications
  • Influence
Modeling and improving selection in cascading pull-down menus using Fitts' law, the steering law and force fields
TLDR
The experiment described here shows that the force fields can decrease selection times, on average by 18%, when a mouse, a track point, or touch pad is used as input device, and suggests that selection times in cascading pull-down menus can be modeled using a combination of Fitts' law and the steering law.
Studying spatial memory and map navigation performance on projector phones with peephole interaction
TLDR
Results show that users performed map navigation equally well on both interfaces and observers of the map navigation on the projector phone were 25% more accurate when asked to recall locations of points of interest after they watched a user performing map navigation.
An evaluation of sticky and force enhanced targets in multi target situations
TLDR
The first study shows that pointing time can be reduced by enhancing a pointing target with an invisible force field that warps the screen cursor toward the target center by using Fitts' law and a force adjusted index of difficulty.
Ad-binning: leveraging around device space for storing, browsing and retrieving mobile device content
TLDR
In a task requiring exploration, AD-Binning improves browsing efficiency by avoiding the minute selection and flicking mechanisms needed for on-screen interaction and concludes with design guidelines for off screen content storage and browsing.
Revisiting peephole pointing: a study of target acquisition with a handheld projector
TLDR
This work presents a user study performed with a handheld projector showing that Cao et al.'s model only outperforms Fitts' law in prediction accuracy when different peephole sizes are used and users have no prior knowledge of target location, and presents the implementation of an orientation aware handheld projector that enables peepholes interaction without instrumenting the environment.
Are you comfortable doing that?: acceptance studies of around-device gestures in and for public settings
TLDR
Recommendations for around-device input designers are presented and new approaches for evaluating the social acceptability of novel input methods are suggested.
The Video Browser Showdown: a live evaluation of interactive video search tools
TLDR
Results from the second Video Browser Showdown (VBS2013) are presented and it is shown that the sophisticated tools enable better performance in general, but for some tasks common video players provide similar performance and could even outperform the expert tools.
Why it's quick to be square: modelling new and existing hierarchical menu designs
TLDR
The value of modelling in HCI design is shown, new insights about performance are provided with different hierarchical menu designs, and a new high-performance menu type is demonstrated.
Improving Window Switching Interfaces
TLDR
Two design principles are identified, spatial constancy in the layout of items in a switching interface can aid memorability and support revisitation and gradually adjusting the size of application and window zones in a switcher can improve visibility and targeting for frequently-used items.
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