1

Today’s Goal:Web Design for Usability

• To become able to appreciate the role of usability in Web design

• To become able to identify some of the factors affecting the usability of a Web page

2

When I look at a Web page it should beself-evident, obvious, self-explanatory

I should be able to ‘get it’ - what it is &how to use it - without expending

any effort thinking about it

excerpt from Steve Krug’s book Don’t Make Me Think

3

What’s a Good Site?

• The one that achieves the result that it was designed for

• Generally, that result can only be achieved by giving the user what s/he wants, as quickly as possible, without her/him expending much effort

• One definition of usability: Let the user have what s/he wants, quickly, without much effort

• “Quickly” is important!

4

Users don't read; they scan

Users don't make optimal choices; they look for the first good-enough solution

Users don't figure out how things work; they muddle through

5

6

Design is Important!

• 62% of shoppers gave up looking for the item they wanted to buy online (Zona Research)

• 40% visitors don’t return to a site if their first visit was a -ive experience (Forrester Research)

• 83% of users have left sites in frustration due to poor navigation, slowness (NetSmart Research)

• Simple designs have greater impact: they can be understood immediately! (Mullet/Sano)

7

Designs should be

consistent &

predictable (unified)

8

9

10

Elements of Website Design

1. Navigation scheme

2. Layout of information

3. Overall look and feel

11

Website Navigation

• The interface/controls that a Website provides to the user for accessing various parts of the Website

• It probably is the most important aspect of the design of a Website

12

A Few Navigation Design Heuristics

1. Put the main navigation on the left of the page

2. It should be ‘invisible’ until it is wanted

3. It should require an economy of action & time

4. It should remain consistent

5. Use text for navigation labels. If you must use icons, put a description underneath each icon

13

Navigation Design Heuristics (contd.)

6. Labels should be clear, understandable

7. Labels should be legible

8. Do not play with standard browser buttons & features

9. Provide search capability

14

15

16

Assisting the User Recover from Errors

• Location, post code mismatch

• Credit card number errors

• Phone numbers

• Spelling errors

17

A few constructive recommendations

Let’s look at a few Web sites and see how we can improve their usability

18

Enter

Dragon’s Lair

All rights reserved, 2002.

19

SKIPRESTART

LOADING …

Click here to go to the main page directly

20

21

A few more Web design heuristics

22

1. Designing (arranging)

Display Elements

23

Making Display Elements Legible

1. Elements must be large enough tobe processed visually

2. Elements must contrast sufficiently with their backgrounds

24

Making Display Elements Legible

3. Related elements should be visually grouped through the use of space, color, or graphical boundaries

4. The relative levels of importance among elements in a display should be revealed graphically

25

26

2. Ensuring Text is

Readable

27

1. Use sans serif (e.g. Arial, Helvetica, Verdana) typefaces for display on screen

2. Display type intended for continuous reading at 10 to 14 points

3. Avoid the overuse of bold and italics

4. Avoid setting type in all caps

28

29

30

5. Arrange type intended for extended reading flush left, ragged right

6. Avoid lines of type shorter than 40 characters and longer than 60 characters

31

7. Mark the boundaries between paragraphs with blank lines rather than indentation

8. Use headings and subheadings to visually reveal the relationships among text elements they label – paragraphs after paragraphs of text do not work that well on the Web

32

3. Using Pictures &

Illustrations

33

Avoid using pictures that are strictly decorative

34

4. Using Motion

35

1. Use motion to attract the viewer’s attention

2. Avoid the use of motion for “cosmetic” purposes

36

Success is defined by the user, notnot the builder