Deliberately making things difficult

의도적으로 사용성을 낮추는 방법:

• Hide critical components: make things invisible.
• Use unnatural mappings for the execution side of the action cycle, so that the relationship of the controls to the things being controlled is inappropriate or haphazard. (see Natural mapping)
• Make the actions physically difficult to do.
• Require precise timing and physical manipulation.
• Do not give any feedback.
• Use unnatural mappings for the evaluation side of the action cycle, so that system state is difficult to interpret. —p206, The design of everyday things