1. Human-Computer Interaction Introduction to HCI
(c) 2001, Tralvex Yeap. All Rights Reserved

2. LEARNING OUTCOME Define HCI Why HCI is Important
Describe the Model Human Processor
(c) 2001, Tralvex Yeap. All Rights Reserved

3. Overview of HCI
(c) 2001, Tralvex Yeap. All Rights Reserved

4. Definition of HCI
Human-computer interaction is a discipline concerned with the design, evaluation and implementation of interactive computing systems for human use and with the study of major phenomena surrounding them.
(ACM SIGCHI, 1992, p.6)
Other terms: user interface, man-machine interface, ergonomics, human factors
(c) 2001, Tralvex Yeap. All Rights Reserved

5. Intro What is a user interface? Why do we care about design?
We see this all the time.
What’s good about the design of this error box?
The user knows there is an error
What’s poor about the design of this error box?
Discouraging
Not enough information
No way to resolve the problem (instructions or contact info)
(c) 2001, Tralvex Yeap. All Rights Reserved

6. M1: Introduction to HCI H… C… I…
Human
- the end-user of a program
- the others in the organization
Computer
- the machine the program runs on
Interaction
- the user tells the computer what they want
- the computer communicates results
(c) 2001, Tralvex Yeap. All Rights Reserved

7. Why is HCI Important?
HCI has a role in the design and development of all kinds of computer systems.
Harnessing the computer’s power is a task for designers who understand the technology and are sensitive to human capacities and needs (human factors).
Applications developers who apply human-factors principles and processes are producing exciting and useful interactive systems.
(c) 2001, Tralvex Yeap. All Rights Reserved

8. Introduction to HCI
Human-Computer Interaction (HCI) is about designing computer systems that support people so that they can carry out their activities productively and safely. (Preece, p.1)
HCI studies human performance in the use of computer and information systems. This is a rapidly expanding research and development area.
(c) 2001, Tralvex Yeap. All Rights Reserved

9. Why HCI is Important The study of our interface with information.
It is not just ‘how big should I make buttons’ or ‘how to layout menu choices’
It can affect
Effectiveness
Productivity
Morale
Safety
Example: a car with poor HCI
(c) 2001, Tralvex Yeap. All Rights Reserved

10. A Brief History of Computing
From calculation to information processing
From offline-processing to online interaction
From house-size to palm-size
From expert’s tools to end-user computing
(c) 2001, Tralvex Yeap. All Rights Reserved

11. Component disciplines of HCI
Computer science
Cognitive Psychology
Ergonomics and human factors
Linguistics
Artificial intelligence
Philosophy, Sociology, Anthropology
Design and Engineering
“HCI is the neither the study of humans nor the study of technology, but rather the bridging between those two.” Preece, p42.
(c) 2001, Tralvex Yeap. All Rights Reserved

12. Specific Human factors Design Goals
Preece (p.14-15) describes “the goals of HCI are to produce usable and safe systems, as well as functional systems”.
Goals include:
o Safety (eg safety-critical systems)
o Utility (functionality)
o Effectiveness (intuitive)
o Efficiency (task achievement)
o Usability (easy to learn and use)
(c) 2001, Tralvex Yeap. All Rights Reserved

13. HCI/UI Design Cycle Design Evaluate Prototype
(c) 2001, Tralvex Yeap. All Rights Reserved

14. Model Human Processor Formulated by Card, Moran and Newell (1983)
(c) 2001, Tralvex Yeap. All Rights Reserved

15. The three Subsystem Perceptual Subsystem Motor Subsystem
Handling sensory stimulus from the outside world
Motor Subsystem
Controls action
Cognitive Subsystem
Provide the processing needed to connect sensory and action
(c) 2001, Tralvex Yeap. All Rights Reserved

16. Input-output channels
Input in human through the senses
Output through motor control
Three (3) primary senses:
Vision
Hearing
Touch
(c) 2001, Tralvex Yeap. All Rights Reserved

17. Vision Perceiving size and depth Perceiving brightness
Perceiving color
(c) 2001, Tralvex Yeap. All Rights Reserved

18. Hearing The auditory system convey information of the environment
Processing sound
Pitch
Loudness
Cocktail party effect
(c) 2001, Tralvex Yeap. All Rights Reserved

19. Touch Virtual reality Feedback responses
(c) 2001, Tralvex Yeap. All Rights Reserved

20. Activity 1: Test memory 1 bun 6 sticks 2 shoe 7 heaven 3 tree 8 gate
4 door 9 wine
5 hive 10 hen
(c) 2001, Tralvex Yeap. All Rights Reserved

21. End
(c) 2001, Tralvex Yeap. All Rights Reserved