Takeaway Points
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If you want to make things easier to hit, make them bigger. If you want them harder to hit, make them smaller.
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Things that touch the screen edge are easier to hit. Corners are easiest.
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The motion of the cursor should be in line with the form of the target—that is, if the user is moving the mouse horizontally to hit a target, making the target’s form horizontal makes it easier to hit.
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Things that are closer to the cursor can be reached by the user more quickly.
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Leave some room between different clickable things.
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