interface design multimedia and web. today’s objectives introduce user-center design guidelines...
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Interface design
Multimedia and Web
Today’s Objectives
Introduce User-Center Design Guidelines CSS
Project portfolio page
Defining ID
Terms
Defining ID User interface (UI): computer-mediated means to
facilitate communication between human and an artifact.
User Interface (UI) - means by which humans interact with a computer to fulfill a purpose.
Communication Channel – something that mediates between the user and the computer.
Controls input and output - translator
Defining ID
One approach to present a problem:
Identify as many sets of any 3 numbers from 1 to 9 that sum to 15.
e.g., 1, 9, 5 is one set because 1+9+5 = 15
Defining ID
1
2
34
5
67
8
9
Here is another way to present the problem
Identify as many sets of any 3 numbers from 1 to 9 that sum to 15.
Defining ID
What makes an What makes an interface good?interface good?
Defining ID
What is a good interface?A good ID encourages an easy, natural, and
engaging interaction between users and system… BUT
Must be concerned with whether an interface is good, bad, or poor, etc. in relation to usability.
User Centered Design
Model & approaches
What is User-Centered Design?
Places the person (as opposed to the 'thing') at the center.
Focuses on cognitive factors (such as perception, memory, learning, problem-solving, etc.) as they impact interactions.
http://www.stcsig.org/usability/topics/articles/ucd%20_web_devel.html
RequirementDefinition
System &Software Design
ImplementationUnit Testing
Integration &System Testing
Operation & Maintenance
Waterfall Life Cycle Model
RequirementDefinition
System &Software Design
ImplementationUnit Testing
Integration &System Testing
Operation & Maintenance
Waterfall Life Cycle Model
User involvement
• Sequential phases• Each phase complete before the next
Iterative design process
User Testing
Design
Prototyping
e.g., Agile model
Iterative design process
User Testing
Design
Prototyping
• Involve users throughout the process• Process is highly iterative
Source: Lynch & Horton, http://webstyleguide.com/wsg3/1-process/7-development-process.html
The Site Development Process Model
Lynch & Horton
Source: Lynch & Horton, http://webstyleguide.com/wsg3/1-process/7-development-process.html
The Site Development Process
Lynch & Horton
• Broad input & participation in beginning.
• Narrow focused team at the end.
• Necessary, to finish your site on time and on budget.
User centered design
Common approaches
User-Centered Design
Major activities:1. Understand/specify the context of use
2. Specify user and organization requirements
3. Create prototypes
4. Evaluate designs with users against requirements.
(British Standards Institution 1998; Stone, Jarrett, Woodroffe, & Minocha, 2005)
SOURCE: http://www.usability.gov/methods/process.html
www.usability.gov
SOURCE: http://www.usability.gov/methods/process.html
www.usability.gov
User-Centered Design Major Steps
1. Requirements-definition - client gives developers information about functionality and requirements.
2. Establish design for the project.
3. Develop prototypes that reflect the emerging design, using the programming language or development environment.
User-Centered Design
Major Steps
4.Submit prototypes to client for feedback and modifications.
5.Revise prototypes to reflect the client’s changes.
6.Repeat steps 3 and 5 for additional part of the system.
User-Centered DesignSeeks to answer questions about users and their tasks
and goals such as: Who are the users of this 'thing'?
What are the users’ tasks and goals?
What are the users’ experience levels with this thing, and things like it?
How can the design of this ‘thing’ facilitate users' cognitive processes?
User-Centered Design What hardware, software, and browsers do the users
have? What relevant knowledge and skills do the users already
possess? What functions do the users need from this interface? How do they currently perform these tasks? Why do the users currently perform these tasks the way they
do? What information might the users need and in what form? What do users expect from this Web site? How do users expect this interface will work?
Site Development Process(Lynch & Horton)
Site definition and planning Information architecture Site design Site construction Site marketing Tracking, evaluation, and maintenance
Source: Lynch & Horton, http://webstyleguide.com/wsg3/1-process/index.html
Source: Lynch & Horton, http://webstyleguide.com/wsg3/1-process/7-development-process.html
The Site Development Process
Lynch & Horton
The first step to design web site is to define your goals.
Careful planning and a clear purpose are the keys to success in building web sites, particularly when working with a development team.
Source: Lynch & Horton, http://webstyleguide.com/wsg3/1-process/index.html
Site Development Process(Lynch & Horton)
Step 1:
Gather development team, analyze needs/goals, and work through development process to refine plans.
Source: Lynch & Horton, http://webstyleguide.com/wsg3/1-process/index.html
Site Development Process(Lynch & Horton)
Step 2: Create charter document:
what you intend to do and why, what technology and content you’ll need, how long will process take, how much you will spend, and how you will assess the results of your efforts.
Source: Lynch & Horton, http://webstyleguide.com/wsg3/1-process/index.html
Site Development Process(Lynch & Horton)
Charter document is crucial to creating a successful site:
Charter document is blueprint and will help keep project focused on the agreed-on goals and deliverables.
Site Development Process(Lynch & Horton)
Design guidelines
Home: Communicating the purpose
Design guides• Try to accommodate a majority (95%) of all users.
• As of Jan. 2008, 48% of users had screen resolution set at 1024x768; and 38% had it higher.
• As of Jan. 2009, 36% of users had screen resolution set at 1024x768; and 57% had it higher.
• 1024 x 768 is still one of the most popular screen resolutions in 2009 (others 1280 x 800, 1280 x 1024, 1680 x 1050 & 1440 x 900)
• Ensure all testing of sites is done using the most common screen resolutions.
Source Research-Based Web Design & Usability Guidelines US Government Usability Guidelines;http://www.w3schools.com/
Display Resolution (Jan 2008)
Source: W3Schools:, Web Statistics and Trends: http://www.w3schools.com/browsers/browsers_display.asp
Display Resolution Jan. 2009
Source: W3Schools: Web Statistics and Trends: http://www.w3schools.com/browsers/browsers_display.asp
Browsers (July 2008)
Source: W3Schools:, Web Statistics and Trends: http://www.w3schools.com/browsers/browsers_display.asp
Browser Use July 2009
Source: W3Schools: Web Statistics and Trends: http://www.w3schools.com/browsers/browsers_display.asp
Design guidelines: Home
Many people have screen resolutions of 1024X768. In time, 1024X768 will be the smallest.
Width: design pages at roughly 984 pixels for 1024X768 resolution.
Width: design pages at roughly 760 pixels for 800X600 resolution.
Design guidelines: Home
Show company name or logo in a reasonable size and location on the home page.
Include a tag line. Indicate what your site does that is valuable
from users’ perspectives. Give prominence to the highest priority tasks
(e.g., purchase books, check stock quotes, etc). Make the home page distinct from other pages.
Design guidelines
Liquid design rather than frozen. Page length: roughly two full screens.
Don’t cram everything on one page. Make sure important features are “above
the fold”
Design guidelines
Logo – upper left Logo is a link to the home page on all
pages except the home page. Logo size roughly 74px X 74px
Design guidelines
Search – upper portion of screen – upper right
Search on every page Search box 35 characters wide
Cascading Style Sheets
CSS
Cascading Style Sheets
HTML was not meant to specify an exact appearance for your Web pages.
CSS (Cascading Style Sheets) allows you to specify more information about the appearance of elements on a Web page.
Zen Garden
Structure and style
Structure document with html<ul><ol><dl><h1..6><p><div><span>
Focus on content and organization first. All documents should be readable without
CSS.
Structure and style
Use styles to attached to block in document (<h1>, <p>, <div>, <span>…)
Use classes for repeated styles
Use IDs to style a specific section
Cascading Style Sheets
A style sheet is a set of one or more rules that apply to an HTML document.
h1 { color : red; }
Cascading Style Sheets
Why use styles?
Cascading Style Sheets
Update the look of a Web site by changing a single document.
Keep content separate from styling.
Greater typography and page layout control
Easier site maintenance
External Styles
page4.htm
page6.htmpage7.htm
page2.htmpage3.htmpage1.htm
index.htm Style.cssStyle.css
page5.htm
• Make changes from a single document• Changes multiple documents
• Make changes from a single document• Changes multiple documents
<link rel="styleSheet" type"text/css" href="styles.css“ />
Rules, Selectors, Declarations
CSS
The Rule
h1 {color : #c0c0c0;}
Rule
The Rule
h1 {color : #c0c0c0;}
Selector Declaration
Rule
The Declaration
Has two parts separated by a colon:
Property - that part before the colon
Value - that part after the colon
h1 {color : #c0c0c0; }
The Declaration
Curly brackets { } help distinguish between selector, property, and value
Colon separates property and values
Semicolon separates declarations
h1 {color : #c0c0c0;}
The Declaration
The level 2 header’s text is blue.
Subject
Object
Verb
Adjective
The Declaration
Subject
Object
Verb = “to be”
Adjective
h2 { color : blue;}
Combining Rules
h1 { color : red; } h2 { color : red; }
h3 { color : red; }
h1, h2, h3 { color : red; }
Types of Style Sheets Inline Styles <h1 style="color:#ff0000">Heading text is red</h1>
Embedded Styles<style type ="text/css">
body { background-color: #000000; color: #FFFFFF;} </style>
External Styles (browser waits for styles before page)<link rel=“stylesheet” type=“text/css” href=“mystyle.css />
Imported Styles (styles applied after page renders)@import url(Layout_A.css);
Types of selectors
1. HTML selector h1 {color : red ;}
2. Class selector .highlight Dependent classes h1.highlight
3. ID selector #site_info
Classes
Classes (applies to more than one type of element – several different styles for the same element.)
.mytext {font-family : Verdana; font-size : 1.5em;}
<p class=“mytext”>Hello World</p>
Dependent Classes
.highlight {background-color : green;}
h1.highlight {text-transform : uppercase;}
/*if highlight class is used with h1, it has green background color and uppercase*/
64
ID Selector id Selector
Use to apply a CSSrule to ONE element on a Web page.
Configure with #idname
The sample creates an id called “new” with red, large, italic text.
To use the id, code the following XHTML:
<p id=“new”>This is text is red, large, and in italics</p>
<style type="text/css">#new { color: #FF0000;
font-size:2em; font-style: italic;
}</style>
Five properties control font characteristics
font-familyfont-stylefont-weightfont-size
CSS Typography
Value is a list of font names in decreasing order of preference
p { font-family: "The Sans", Verdana, Helvetica, sans-serif; }
Names separated by a space should be in “ “
font-family
The font-size Property
Use em or percentage font sizes – these can be easily enlarged in all browsers by users Ex: http://webstyleguide.com/wsg3/1-process/6-types-of-sites.html
line-height property specifies leading
Use percentage (150%), ratio (1.5) or ems (1.5em) to specify leading relative to font size
Leading
text-align property can take values left, right, center or justify
body { text-align: left; } p.display { text-align: center; }
Alignment
CSS Guidelines
Review the design of the pageConfigure global font and color properties
for the body selector Identify typical elements (such as <h1>,
<h3>, and so on) and declare style rules for these if needed.
Identify page areas such as logo, navigation, footer, and so on – configure an appropriate class or id for each.
CSS Guidelines
Create a prototype page that contains most of the elements you plan to use and test.Once your design is set – move styles to an
external .css file
Planning and testing are important activities when designing a Web site
<div id=“wrapper”>
<div id=“header”> </div
<div id=“sideBarLeft”> </div>
<div id=”mainContent”> </div>
<div id=“footer”> </div>
</div>
Box Model
Header
Side Bar Left Main Content
Footer
Wrapper