1. Different Types of HCI CLI Menu Driven GUI NLI
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