lWorkstation→Personal Computer→Laptop→PDA
Walkman→lDigital Audio player→mp3, mp4 (iPod)
Telephone→Cellular phone→Internet phone
Camera→ Digital camera→ Cellular phone with CCD
l◎Specialization of use
 ◎Multi-task (Doing different tasks at the same time)
l◎Work over time (Trends in Asia)
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