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Introduction to Computing

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Introduction to Computing ­ CS101
VU
LESSON 25
WEB DESIGN FOR USABILITY
During the last Lesson ...:
We looked at the role of heuristics in architectural (or high-level) design
We also became familiar with a few popular design heuristics
Heuristic:
Rule of thumb learned through trial & error
Common sense Lesson drawn from experience
Caution!  Caution!
Heuristics don't always lead to the best results
At times they even lead to the wrong ones, but mostly to results that are good-enough
25.1 USABILITY
Today's Goal:
25.1 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
What's a Good Site?
The one that achieves the result that it was designed forGenerally, that result can only be achieved by
giving the user what s/he wants, as quickly as possible, without her/him expending much effortOne
definition of usability: Let the user have what s/he wants, quickly, without much effort"Quickly" is
important!
25.2 SPEED:
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
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)
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Introduction to Computing ­ CS101
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Designs should be consistent & predictable (unified)
25.3 Elements of Website Design:
Navigation scheme
Layout of information
Overall look and feel
25.4 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
25.5 A Few Navigation Design Heuristics:
Put the main navigation on the left of the page
It should be `invisible' until it is wanted
It should require an economy of action & time
It should remain consistent
Use text for navigation labels. If you must use icons, put a description underneath each icon
25.6 Navigation Design Heuristics (contd.):
Labels should be clear, understandable
Labels should be legible
Do not play with standard browser buttons & features
Provide search capability
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Introduction to Computing ­ CS101
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A good
Solution to
Problem
Is nice and
elegent
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Introduction to Computing ­ CS101
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25.7 Good designs assist the user in recovering from errors
25.8 Assisting the User Recover from Errors:
Location, post code mismatch
Credit card number errors
Phone numbers
Spelling errors
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Introduction to Computing ­ CS101
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25.9 A few constructive recommendations
Let's look at a few Web sites and see how we can improve their usability
Enter
Dragon's Lair
All rights reserved, 2002.
LOADING ...
RESTAR
SKIP
T
Click here to go to the main page directly
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Introduction to Computing ­ CS101
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25.10 Making Display Elements Legible:
1. Designing (arranging) Display Elements
Elements must be large enough to be processed visually
Elements must contrast sufficiently with their backgrounds
Making Display Elements Legible:
Related elements should be visually grouped through the use of space, color, or graphical boundaries
The relative levels of importance among elements in a display should be revealed graphically
25.11 Ensuring Text is Readable:
Use sans serif (e.g. Arial, Helvetica, Verdana) typefaces for display on screen
Display type intended for continuous reading at 10 to 14 points
Avoid the overuse of bold and italics
Avoid setting type in all caps
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Introduction to Computing ­ CS101
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Arrange type intended for extended reading flush left, ragged right
Avoid lines of type shorter than 40 characters and longer than 60 characters
Mark the boundaries between paragraphs with blank lines rather than indentation
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
25.12 Using Pictures & Illustrations:
Avoid using pictures that are strictly decorative
25.13 Using Motion
Use motion to attract the viewer's attention
Avoid the use of motion for "cosmetic" purposes
Success is defined by the user, not the builder
In Today's Lecture:
We looked at the role of usability in Web site design
We identified some of the factors affecting the usability of a Web page
Next Lecture:
Computer Networks
We will become able to appreciate the role of networks in computing
We will familiarize ourselves with various networking topologies and protocols
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Table of Contents:
  1. INTRODUCTION
  2. EVOLUTION OF COMPUTING
  3. World Wide Web, Web’s structure, genesis, its evolution
  4. Types of Computers, Components, Parts of Computers
  5. List of Parts of Computers
  6. Develop your Personal Web Page: HTML
  7. Microprocessor, Bus interface unit, Data & instruction cache memory, ALU
  8. Number systems, binary numbers, NOT, AND, OR and XOR logic operations
  9. structure of HTML tags, types of lists in web development
  10. COMPUTER SOFTWARE: Operating Systems, Device Drivers, Trialware
  11. Operating System: functions, components, types of operating systems
  12. Forms on Web pages, Components of Forms, building interactive Forms
  13. APPLICATION SOFTWARE: Scientific, engineering, graphics, Business, Productivity, Entertainment, Educational Software
  14. WORD PROCESSING: Common functions of word processors, desktop publishing
  15. Interactivity to Forms, JavaScript, server-side scripts
  16. ALGORITHMS
  17. ALGORITHMS: Pseudo code, Flowcharts
  18. JavaScript and client-side scripting, objects in JavaScript
  19. Low, High-Level, interpreted, compiled, structured & object-oriented programming languages
  20. Software Design and Development Methodologies
  21. DATA TYPES & OPERATORS
  22. SPREADSHEETS
  23. FLOW CONTROL & LOOPS
  24. DESIGN HEURISTICS. Rule of thumb learned through trial & error
  25. WEB DESIGN FOR USABILITY
  26. ARRAYS
  27. COMPUTER NETWORKS: types of networks, networking topologies and protocols
  28. THE INTERNET
  29. Variables: Local and Global Variables
  30. Internet Services: FTP, Telnet, Web, eMail, Instant messaging, VoIP
  31. DEVELOPING PRESENTATIONS: Effective Multimedia Presentations
  32. Event Handlers
  33. GRAPHICS & ANIMATION
  34. INTELLIGENT SYSTEMS: techniques for designing Artificial Intelligent Systems
  35. Mathematical Functions in JavaScript
  36. DATA MANAGEMENT
  37. DATABASE SOFTWARE: Data Security, Data Integrity, Integrity, Accessibility, DBMS
  38. String Manipulations:
  39. CYBER CRIME
  40. Social Implications of Computing
  41. IMAGES & ANIMATION
  42. THE COMPUTING PROFESSION
  43. THE FUTURE OF COMPUTING
  44. PROGRAMMING METHODOLOGY
  45. REVIEW & WRAP-UP of Introduction to Computing