ICT - Topic 22 (HCI)

ICT - Topic 22 (HCI)

1. command line interface

   • type of instructions, using special words and symbols
   • some commands may have SWITCHES - to provide options for the command (i.e in Microsoft the command for listing files in the folder is called 'DOCS'
   • Advantages
     • the instruction execute quickly
       • the operating dsystem is smaller when loaded into memory
   • disadvantages
     • you need to learn the special instructions
       • if u mistype and instruction or spell it wrong, it cannot be executed

2. Menu-driven interface

   • menu options are displayed for the user using a moues pointer or by pressing key on the keyboard.
   • user friendly
   • several menus available
   • Advantages
     • navigation is simple
     • you don't need to learn what instructions are available
   • Disadvantages
     • some options mean nothing to the user
     • it can be difficult to find options

3. Graphical user interface (GUI)

   • Most modern operating systems use them
   • instructions are selected using a mouse pointer
   • images are used to represent user options (ie image of a printer, when clicked, the file is printed)
   • modern operating systems use WIMP
     • ICON - small meaningfull image
       • MENU - list of option available
   • most GUI'S help is user have difficulty
   • advantrages
     • low level if ICT skills needed
     • no need to learn any instructions
     • pictures are easier to understand then words
     • font size and colour can be changed
     • GUI can be altered to suit your circumstances
   • disadvantages
     • large complex to run
     • uses a lot of recourses - may run slow

4. sound a speech interfaces

   • voice interface
     • microphone is used to speak command words
     • advantage
       • can be used without hands
     • disadvantage
       • people speak differently
       • different languages
   • useful for people with disability or has no hands