COMP 3715 Spring 05

1. COMP 3715 Spring 05

2. Human Computer Interaction (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. (from ACM SIGCHI curricula for Human-Computer Interaction) • Also known as • Computer-human interaction (CHI) • Man-machine interaction (MMI)

3. Human Computer Interaction (HCI) • A discipline concerned with the • design, • evaluation • implementation of interactive computing systems for human use and with the study of major phenomena surrounding them.

4. Why HCI? • Ultimately computer is set up for human to use • User should not be expected to know the details of the computer • Don’t need to be a mechanic to drive a car • Don’t need to be a electrician to use a VCR

5. Why HCI? • Built computers so that • It’s “jargon-free” • People can use it without thinking about it • No physical harm • No/minimal discomfort • Physical • Psychological

6. Why HCI? • From a commercial viewpoint • First impression of the software is crucial • Once company buy a piece of software, not likely to change for years • Easy to use = less training = less cost = more profit = more shelve life

7. The areas of HCI From ACM-CHI curricula for human-computer interaction

8. The areas of HCI • Understanding human as individuals • Physiology: physical capabilities • Psychology: understanding and modeling users • Linguistics: understanding verbal communication • Ergonomics: understanding non-verbal communication

9. The areas of HCI • Understanding human as group • Sociology: Social Organization • Philosophy: Norms and consistency • Anthropology: Culture • Art/Design: Aesthetic appeal

10. The areas of HCI • Understanding/Expanding computer’s capability • Engineering: Hardware • Computer Science • Artificial Intelligence: modeling users, managing knowledge • Graphics: Visual presentation • Natural Language Processing: “Natural” communication • Speech/Image processing: Perception and response from the computer’s side

11. The areas of HCI • Understanding the design/implementation process • Software engineering • Statistical evaluation • Conducting experiments

12. Major issues in HCI • How to design interface • Methodologies and processes • How to implement interfaces • Software toolkits, algorithms • How to evaluate interfaces • Methodologies • New techniques and new kind of interfaces • Modeling the user and predicting behaviour

13. What is user-friendly, anyway? • Usability: (as defined by ISO 9241) • Usability is the extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency, and satisfaction in a specified context of use.

14. What is user-friendly, anyway? • Effectiveness: • The accuracy and completeness with which specified users can achieve specified goals in particular environments. • Efficiency: • The resources expended in relation to the accuracy and completeness of goals achieved. • Satisfaction: • The comfort and acceptability of the work system to its users and other people affected by its use.

15. Design objective of HCI • Learnability • The ease with which new users can begin effective interaction and achieve maximal performance • Flexibility • The multiplicity of ways the user and system exchange information. • Robustness • The level of support provided to the user in determining successful achievement and assessment of goals.

16. Measuring user-friendliness