4.1.9 Human control interface

4.1.9 Human control interface

1. command line (DOS)

   • commands to the computer are done by lines of code
     • needs less processing power so less overheads
   • experts use it to create networks
   • can be quicker and easier if you are computer literate
     • easier to type than click
     • can be confusing
       • requires a lot of typing
       • only experts can use it
       • needs to know commands
       • can be frustrating

2. graphical interface

   • uses windows and shortcuts to display information
     • easier for beginners
   • can use keyboard shortcuts to perform actions faster
   • no need to learn computer language (DOS)
   • use of mouse makes it simpler
   • requires a lot of processing power
     • takes up more space (hard drive, server)
       • usually quite expensive

3. touch screens (EPOS, mobile phones)

   • easier to input data
   • easier to dial numbers
   • dont need key board and mouse
   • easier for disabled people to use
   • not suitable for large amounts of data
     • using fingers makes it hard to select small items

4. biometric

   • uses unique features of the human body
     • security systems
       • unique to the person, cannot be forged
       • cannot loose you fingerprint (you can loose smart cards)
   • high cost

5. speech

   • speech recognistion
     • car sat navs
       • easier to input destination
         • allows driver to focus more on road making it safer
       • may find it difficult to pick up different accents or if user has a cold
       • difficult to pick up different accents
     • empower disabled
     • quicker than typing
     • easier to use than a keyboard
     • takes time to train
     • requires powerful computer
     • background interferance
     • required to speak slowly
   • text to speech