don norman’s interlocks and forcing...
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Don Norman’s Interlocks and Forcing Functions
Jim Rowan Georgia Gwinnett College ITEC 4130
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Forcing Functions
Things (either physical or virtual) that force behavior
Come in the form of constraints – Interlocks – Lock-Ins – Lock-Outs
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Interlocks
Physically block one action by placing the first task in the way of the second
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Forcing Function
Lock-Ins – You can’t quit Powerpoint without either
saving your changes or intentionally disposing of them
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Lockout
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