Human Computer Interface (HCI) Computer Systems in which Humans and Computers interact - PowerPoint PPT Presentation

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Human Computer Interface (HCI) Computer Systems in which Humans and Computers interact

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Human Computer Interface (HCI) Computer Systems in which Humans and Computers interact Different Types of HCI CLI Menu Driven GUI NLI Command Line Interface (CLI ... – PowerPoint PPT presentation

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Title: Human Computer Interface (HCI) Computer Systems in which Humans and Computers interact


1
Human Computer Interface (HCI) Computer Systems
in which Humans and Computers interact
  • Different Types of HCI
  • CLI
  • Menu Driven
  • GUI
  • NLI

2
Command Line Interface (CLI)
  • Text based
  • User types commands and computer carries out when
    enter key pressed
  • E.g. Windows Command Prompt
  • Advantages
  • Good for expert users
  • Uses few resources
  • Very flexible
  • Disadvantages
  • Requires user to learn commands bad for novice
    users
  • Hidden features

3
Menu Driven Interfaces
  • Uses menus to communicate with user
  • Advantages
  • No need to learn complex commands
  • Easier for novice user to learn than CLI
  • Ideal if there are limited options
  • Disadvantages
  • User interface limited by screen space
  • Can frustrate expert user
  • Does not have visual elements of GUI

4
Graphical User Interface (GUI)
  • Combines pictures text
  • Accepts input via devices such as keyboards
    mouse
  • Offers graphical icons and visual indicators
  • E.g. Microsoft Windows
  • Advantages
  • Intuitive and easy to navigate (sounds, pictures
    incorporated)
  • Good for novice users
  • Disadvantages
  • Resource hungry can be slow on old machines
  • Hidden commands must be found using help

5
Natural Language Interface
  • Verbal commands given to computer
  • Advantages
  • Very easy for novice users
  • Quick
  • Hands free (can be used by people with
    disabilities)
  • Disadvantages
  • Can be unreliable
  • Can interpret incorrectly (dialect)

6
HCI Questions
  • Explain the meaning of the term human-computer
    interface (2)
  • Describe a human-computer interface that can be
    used with a particular type of disability (4)

7
Designing an Effective HCI
8
Designing An Effective HCI
  • Consideration should be given to
  • Use of colour
  • Font size
  • Layout
  • Navigation
  • Consistency
  • Help
  • Use by people with disabilities

9
Questions
  • Name four factors which must be taken into
    account when designing a good user interface.
    Explain why each factor is important. (8)
  • Explain one way in which the needs of an expert
    user and a novice user can be accommodated when
    designing the HCI for a piece of software. (2)

10
Input Devices
  • Touch Screens (ATMs, POS)
  • Joystick
  • Iris recognition / hand prints

11
Biometric Devices
  • Iris Recognition
  • Hand Prints
  • Advantages
  • Difficult to forge
  • No smart cards to lose
  • Disadvantages
  • Human rights?
  • New technology little trust bugs in system
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