Accessibility Testing Services

Usability Tips

  • • Remember user goals
  • • Remember site goals
  • • Avoid unnecessary introductions
  • • Provide logical navigation and interactivity
  • • Design for consistency
  • • Don’t overuse animation
  • • Use sound sparingly
  • • Target low bandwidth users
  • • Test for usability

Sample Test for Web Site Usability

  • • Ask users to answer two factual questions based on the website information
  • • Ask users to answer two task oriented questions from the website information
  • • Ask users to share the subjective impressions about the ability of the web site content to meet their needs in   an interview setting
  • • Have users complete a post test survey regarding their overall experience

Advantages of Usability Metrics

  • • You can track progress between releases
  • • You can assess your competitive position
  • • They help you make stop or go decisions prior to product launch
  • • They can serve as the basis of bonus plans for design managers

Usability Performance Measures

  • • Time to learn
  • • Speed of performance
  • • User error rates
  • • Retention over time
  • • Subjective satisfaction

How many users do you need to measure?

  • • If you are doing qualitative testing, it is enough to obtain data from 3 to 5 users
  • • If you are collecting quantitative data, you should test 20 or more users

Measuring Success

  • • % improvement can be useful (eg. time to complete task in old and new design)
  • • Several % improvement scores are may be combined by computing their geometric mean
  • • Geometric mean in the Nth root of the product of N numbers

What are accessibility concerns?

  • • Low visual acuity
  • • Color blindness
  • • Deafness
  • • Language impairments
  • • Cultural differences

Why make pages more accessible?

  • • Reach as many readers as possible
  • • Automation tools and search engines work better
  • • Concern over customer alienation

Accessibility Strategies

  • • Adhere to accessibility guidelines
  • • Test for accessibility
  • • Provide alternate pages to accommodate users with varying needs

Accessibility Guidelines - part 1

  • • Tables are fine, IF they read left-right/top-bottom
  • • Text columns are ok if the spacing works in various environments
  • • ’Fancy Stuff' - i.e. fonts, style sheets - as long as page is functional with these options turned off
  • • Provide 'ALT' text for graphics
  • • Make image maps client side
  • • Provide useful text links (e.g. not 'click here')

Accessibility Guidelines - part 2

  • • Provide good keyboard navigation
  • • Alternatives for controls and applets
  • • Frames/Noframes, (be sure to provide a reasonable 'noframe' option)
  • • Be aware of unusual formats
  • • Avoid scrolling marquees
  • • Provide titles/names for most objects

Testing for Accessibility

  • • Turn off graphics
  • • Turn off sound
  • • Turn off style sheets
  • • Choose "high contrast" option
  • • Use largest font size
  • • Re-size browser window
  • • Navigate using keyboard
  • • Select all text and copy into clipboard, paste elsewhere
  • • Use a specialized browser or analysis tools