Quote: comparison of constrained pointing tasks and goal-crossing tasks for speed and accuracy

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Participants performed six different tasks, including two pointing … constraint--one collinear and the other orthogonal to the … [e.g., crossing a window's border] differed by both the constraint direction (collinear/orthogonal) and the nature … To our knowledge, no performance model has been … [for four of these tasks] … [p. 75] This crossing task is discrete since the … the stylus is lifted from the tablet surface. … In all six tasks, participants were asked to …   Google-1   Google-2

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