• Publications
  • Influence
Beyond Fitts' law: models for trajectory-based HCI tasks
A great number of studies have verified and / or applied Fitts' law to HCI problems, making Fitt's' law one of the most intensively studied topic in the HCI literature. Expand
Manual and gaze input cascaded (MAGIC) pointing
This work explores a new direction in utilizing eye gaze for computer input by proposing an alternative approach, dubbed MAGIC (Manual And Gaze Input Cascaded) pointing, which might offer many advantages, including reduced physical effort and fatigue as compared to traditional manual pointing, greater accuracy and naturalness than traditional gaze pointing, and possibly fasterspeed than manual pointing. Expand
More than dotting the i's --- foundations for crossing-based interfaces
This paper systematically evaluates two target-pointing tasks and four goal-crossing tasks, which differ by the direction of the movement variability constraint (collinear vs. orthogonal) and by the nature of the action (pointing vs. crossing, discrete vs. continuous). Expand
Human Performance in Six Degree of Freedom Input Control
The physical properties of a 6 DOF input device should provide rich feedback so that the user can easily feel her control actions proprioceptively and thus learn the task quickly. Expand
Refining Fitts' law models for bivariate pointing
Investigating models based on the notion of weighted Lp norm, it was found that the empirical findings were best captured by an Euclidean model with one free weight, which significantly outperforms the best model to date. Expand
High precision touch screen interaction
Two techniques are proposed: Cross-Keys that uses discrete taps on virtual keys integrated with a crosshair cursor, and an analog Precision-Handle that uses a leverage (gain) effect to amplify movement precision from the user's finger tip to the end cursor. Expand
SHARK2: a large vocabulary shorthand writing system for pen-based computers
The architecture, algorithms and interfaces of a high-capacity multi-channel pen-gesture recognition system that supports a gradual and seamless transition from visually guided tracing to recall-based gesturing are designed and implemented. Expand
Characterizing computer input with Fitts' law parameters-the information and non-information aspects of pointing
  • Shumin Zhai
  • Mathematics, Computer Science
  • Int. J. Hum. Comput. Stud.
  • 1 December 2004
It is shown that TP defined as ID/ MT is an ill-defined concept that may change its value with the set of ID values used for the same input device and cannot be generalized beyond specific experimental target distances and sizes. Expand
The metropolis keyboard - an exploration of quantitative techniques for virtual keyboard design
Two computerized quantitative design techniques to search for the optimal virtual keyboard layouts are presented, illustrating the advantage of quantitative user interface design techniques based on models of human performance over traditional trial and error designs guided by heuristics. Expand
Touch behavior with different postures on soft smartphone keyboards
It is found that distinct patterns exist for input among the three hand postures, suggesting that keyboards should adapt to different postures and implications for design and improvements of soft keyboards. Expand