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Evaluates the design of a one-handed typing technique performed on a standard keyboard with modified software. Usability to facilitate the transfer of two-handed touchtyping skill to the one-handed condition; User's ability to touch-type on a standard QWERTY keyboard; Speed of one-handed and two-handed chord keyboard typing.

Explores the articulatory and cognitive aspects of marking menus for different numbers of items per menu using different input devices. Execution of the physical actions from the pie marking menu; Comparison between the performance of the subject better with the mouse and stylus than with the trackball; Degradation on the performance of the subjects given an increased number of items.

Examines the use of different kinds of feedback in preventing mode errors. Definition of a mode error; Frequency of mode errors in a text-editing task; Comparison of effectiveness between kinesthetic and visual feedback; Factors contributing to the superiority of kinesthetic feedback.