Human-Computer Interaction Principles and Usability

Chapter 1: Human-Computer Interaction (HCI) Fundamentals

Definition of System Quality

The degree to which a system, process, or component:

• Meets the specified requirements.
• Complies with customer and user expectations.

Key Stages in System Development

Design

Focus beyond the interface; consider the overall screen presentation and user interaction context.

Assessment

Rigorous testing is necessary (not everything is "fantastic"). Assessing usability effectively is often the most challenging aspect.

Deployment

Consider the user perspective (e.g., how they make requests or attend meetings). HCI is related to data processing and is an interdisciplinary science based in Computer Science.

Factors Involved in HCI

• People.
• Machinery.

Approaches

• User-centric focus.
• Technology and HCI in Chile: Relatively little development, often lacking collaboration or coordination, though exceptions exist.

Content Focus

• Usability.
• Press (Media interaction).
• World Wide Web.

Assessment Structure Example

Assessments might be weighted as 40% + 60% (e.g., Project 50% + 10% tasks).

Important Dates (Example)

Test 1: Friday, 10-10-09.

Test 2: Saturday, 04-12-09 (Note: 28-11-09 mentioned).

Work and presentation deadlines.

References

Nielsen J.

Class 2 Topics (Prototype Evaluation)

• Introduction.
• Brief description of the problem and purpose of the prototype system.
• Heuristic evaluations.
• Other usability assessments.
• Prototype versions and analysis.
• Conclusions.
• References.
• Index.

Conclusion on HCI Scope

Key Takeaways:

• HCI must account for specific human and computational aspects.
• HCI is only one area within communication support.

Important Distinction: Users $\neq$ Customers.

A test cannot be completed effectively in 30 minutes; users become bored.

HCI as an Interdisciplinary Area

The minimum number of users required to establish evidence is typically 3, 4, or 5 per user profile.

• Not all customers will be satisfied.
• HCI encompasses more than just usability.

Historical Roots

• Computer Graphics: Influenced modern graphic interfaces.
• Human Factors: Focused on ease of use with machines (e.g., WWII applications).
• Ergonomics: Relates to what is visible on the screen.
• Industrial Psychology: Aimed at making programs more efficient and pleasant.

HCI is highly susceptible to changes in technology and hardware.

Current Trends

• Communication available anywhere.
• High-functionality systems (leading to potentially more complex interfaces).
• Unconventional interaction methods.

PPT 2 Focus: People

The most important aspect is understanding how people interact with machines.