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User Interface Design CIS 322 r.spiegel@gold.ac.uk http://homepages.gold.ac.uk/spiegel/index.htm Office hours: Tuesday 1-2pm Thursday 12-1pm Room 14 25 St James Lectures: 27 hours in total Revision next term Exam at the end of this academic year Overview : First Lectures:

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user interface design cis 322

User Interface DesignCIS 322

r.spiegel@gold.ac.uk

http://homepages.gold.ac.uk/spiegel/index.htm

Office hours: Tuesday 1-2pm

Thursday 12-1pm

Room 14

25 St James

lectures

Lectures:

27 hours in total

Revision next term

Exam at the end of this academic year

overview

Overview:

First Lectures:

Introduction. What is User Interface Design and Human Computer Interaction.

Following Lectures:

Human Aspects and Characteristics of Interaction.

overview continued

Overview (continued):

Middle of term:

Design approaches.

Later during term:

Tools and techniques.

End of term:

Evaluation of user interface design.

overview continued5

Overview (continued):

Also at end of term:

Practical session where you have a chance to think in small groups how to design good user interfaces for particular purposes.

literature

Literature:

Jasna Kulji‘s User Interface Design

CIS322 Course Booklet.

Preece, Rogers, Sharp, Benyon, Holland

& Carey (1994). Human Computer Interaction. Wokingham: Addison-Wesley.

slide7

What is User Interface Design?

Many electronic devices are interactive systems, where users and the device interact through a User Interface (often through a Graphical User Interface).

Examples: Both hardware and software for Desktop computers, Laptops, PDA‘s (=Personal Digital Assistants, handheld devices), Mobile Phones, DVD Players, MP3 Players, Electronic Wearables etc.

slide11
Electronic wearables, e.g. controlling audio players, healthcare (measuring heartrate, stress hormons, etc.)
slide12

For these devices to be accepted by the user, they must be effective and particularly well designed.

User interface design is particularly important for wireless devices and these devices will become even more important in the future.

various terms one meaning

Various terms, one meaning

Human Computer Interface (HCI)

Human Computer Interaction (also HCI)

Human Systems Interface (HSI)

Computer Human Interaction (CHI)

No agreed definition!

slide14

I will rely on the meanings adapted in Jasna Kuljis‘ User Interface Design booklet.

In this booklet, the meaning of Human Computer Interaction is broader and the meaning of User Interface Design is more specific.

slide15

User Interface Design: explicit design of the interface, by incorporating both software and hardware issues.

However, some authors also consider User Interface Design within the overall system design framework, including social and organisational factors as well as evaluation of the system.

This is what Jasna Kuljis refers to as Human Computer Interaction.

slide16

Purpose of

Human Computer Interaction:

1. Analysis of what people need

2. Design of devices (at first: design of prototypes)

3. Evaluation whether users find them effective

4. Implementation and improvement of devices

goals of human computer interaction

Goals of Human Computer Interaction

To improve the safety, utility, effectiveness, efficiency and usability of systems that include computers or related electronic devices.

usability

Usability

The degree to which specific users can achieve specific goals within an environment (Booth, 1989).

Shackel (1991) suggests 4 usability criteria:

Effectiveness

Learnabililty

Flexibility

Attitude

usability continued

Usability (continued)

Shackel (1991) proposed to measure these criteria quantitatively. The criteria may be interrelated, i.e. better effectiveness can correlate with better learnability.

Quantitative measurements tell about extent of usability, but do NOT tell how to improve the usability of a system (Booth, 1989).

Qualitative information tells designers how to improve system.

usability continued20

Usability (continued)

General Interface Usability Principles for

Graphical User Interfaces (Molich & Nielsen,

1990)

Simple dialogue in user‘s language

Minimise memory load

Consistency

Feedback

Clearly marked exits

Clever Shortcuts

Good error messages

Prevent Errors in the first place

usability continued21

Usability (continued)

The General Interface Usability Principles (Molich & Nielsen, 1990) support the four identified usability dimensions by Shackel (1991): Effectiveness, Learnability, Flexibility and Positive User Attitude.

different users

Different Users

Adjusting design to specific needs of the users

Different age groups of users

Study of user behaviour, user abilities to interact with programs and devices etc.

usability defects

Usability Defects

Anything in the product that complicates completing the task:

Unnecessary Navigation

Poor Design or Layout

Inappropriate Feedback (too little or too much)

Poor Terminology (unclear words or abbreviations)

Problems with Modality (e.g. when switching modes)

Inconsequential Redundancies (e.g. repetitions)

No Match with User Tasks (expectations unfulfilled)

User has no trust in the system

how do we design good user interfaces

How do we design good User Interfaces?

(we will talk about this in greater detail at the end of the term)

For now: combining technical and design knowledge with knowledge about human interests and capabilities and knowledge about social, organisational and physical aspects of users‘ environment (e.g. work, spare time etc.).

interdisciplinary approach of human computer interaction

Interdisciplinary Approach of Human Computer Interaction

Computer Science

Artificial Intelligence

Visual Arts, Design and Media Studies

Information Engineering

Cognitive Psychology

Social and Organisational Psychology

Sociology and Linguistics

Ergonomics and Human Factors