Abstract
Impenetrable borders are edges of graphical user interface targets (e.g., buttons, scroll bars) that the mouse cursor cannot cross. Research has shown that targets with impenetrable borders (edge targets) are selected faster than targets without impenetrable borders (non-edge targets). In addition, prior research determined that the effectiveness of impenetrable borders is maximal between .50 and 11.75 cm distance from the cursor's origin to the target. However, this is a broad range and a more specific estimate of distance would be useful for designers wishing to maximize the effectiveness of impenetrable borders. Accordingly, the reported experiment searched for the critical distance where impenetrable border effectiveness asymptotes using a graphical web browser interface. Results indicate that impenetrable border effectiveness asymptotes between .50 cm and 3.50 cm distances. These results support past research and make a more detailed design recommendation. An example of a redesigned interface incorporating impenetrable borders is given.
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