1. mainframe
   1. Time-sharing
   2. batch processing
2. supercomputers
3. personal computer
4. embedded
   1. airbag control unit
      1. accelerometers
         1. microelectromechanical systems (MEMS)
5. ubiquitous computing
6. persuasive computer
7. Smart Dust computer
   1. mote
      1. To qualify as a mote, a computer and its sensors, antenna and power source would have to fit inside a 1 mm cube.
8. Machine-readable tags
   1. radio frequency identification (RFID)
   2. Bar code
      1. universal product code (UPC)
      2. QR code
   3. ColorCode
   4. ReacTIVision
   5. fp code
9. tangible device
   1. Surface table-top system
10. fiduciary markers
11. Ambient computing
    1. ambientROOM
12. context awareness
13. artificial intelligence (AI)