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Three basic tasks were designed to measure how fast a user could position a cursor at various locations on an electronic display. The tasks were arbitrary cursor positioning, sequential cursor positioning, and check-reading for errors. Three cursor positioning devices were tested. Both lightpen and lightgun permitted faster cursor positioning than a poorly designed keyboard. These pointing devices were four to five times faster than the keyboard for the arbitrary positioning task, and about twice as fast for the other tasks.
Nancy C. Goodwin (Sun,) studied this question.