Transcript HCI / Usability
Web Design
Why is design important for the web?
Traditional systems You controlled the user You know exactly who you are designing for You know the exact screen spec Web Pages….
You don’t know how they got there – via home page or direct Search Engines Bookmarks
Planning the site..
Design your site What are your goals for the site? Who is the audience for the Web site? Is a web site useable If its not, then it will not attract visitors How will you measure the success of your site? Consider the purpose of the site Test the site with users
Design Principles
Useable Colour Layout Predictability / Consistency / Guidance not control Economy - Minimum number of steps necessary Accessibility Making it available to all
Web Page Design
Storyboards / screen mockups Flow Charts / Page linkage
Storyboards
A4 piece of paper, pen, Post-it Notes PowerPoint with notes view on Needs details of fonts, sizes, style sheet, pictures, text Should be able to pass it to someone else and they build it
Rough example
Advantages and Disadvantages of Storyboards
Advantages Paper based so quick to draw Application independent Little or no skills required !
Disadvantages Does not provide a realistic front end Does not provide full functionality Difficult to change (rub out!)
Designing a template
Gets your style sheet sorted Build with rubbish content – just for page layout http://www.soc.staffs.ac.uk/flk1/test/test.htm
A web site map / Flow chart
Drawn by hand / Done On Computer Shows navigation through the web site Can end up being a spiders web mess Home About Us Company info Products
Multi-Dimensional Map
Home Products Company Map CD DVD Latest Offers
Design Aspects Colour
2006
January 2006 July 2005 January 2005 July 2004 January 2004 July 2003 January 2003 October 2002
Colour
16,777,216
81% 77% 72% 69% 65% 55% 51% 49%
65,536
16% 20% 25% 28% 31% 40% 44% 46%
256
3% 3% 3% 3% 4% 5% 5% 5% Source: W3 Schools
Colour and Design
Colour is very effective for highlighting, but must be used carefully.
Don’t use too many colours on one screen Be consistent across the whole system one colour should not be used for more than one purpose.
Colours which clash should be avoided e.g. purple with pink.
Colour Blind
Care should be taken as 1 in 12 men and 1 in 200 women are colour blind.
Colour Blindness
http://www.vischeck.com/ http://www.iamcal.com/toys/colors /index.php
Hats.
As seen by a person with deuteranopia.
As seen by a person with protanopia, another form of red/green deficit.
Presentation And Contrast
Positive presentation is when the background is fairly subdued, i.e. white background, dark text Negative presentation – dark background, white text.
Bright colours can be too much in blocks. Consider panels
Panels
Fonts
Type Face
Font Size to be readable - clear and not unusual Use default or range of fonts as the default Don’t use more than 2 fonts on a page (unless you are displaying computer code then a third font is ok) Some fonts can be should be avoided.
difficult to read , and Left Justified most of the text – can centre or right justify a few lines for effect Contrast foreground to background Avoid blinking, zooming or moving text
Mac or PC – spacing and fonts..
Font size
W3C recommends that you let users set the base font size in their browser and that you set all sizes using "em". Using em, if the user-set default is 12-point, then a 2-em text indent would be 24-point, but if the user used the text zoom feature of the browser to change the size to 16 point, the indent would change to 32 point.
Browser font size..
http://www.soc.staffs.ac.uk/flk1/test/font.htm