Strength of Evidence:
Document Type: Guideline
Design the Web site so it will work well with the most popular operating systems.
Designers should attempt to accommodate ninety-five percent of all users. Ensure that all testing of a Web site is done using the most common operating systems.
Currently, the most popular operating system is Microsofts Windows XP which has over 80 of the market share. The second is Windows 2000 (eight percent), then Windows 98 (five percent), and the Macintosh (three percent). Designers should consult one of the several sources that maintain current figures to help ensure that they are designing to accommodate as many users as possible.