Table II.

Usability index

1.	Homepage has three or fewer groupings of text/images
2.	Homepage includes basic instructions on how to use a mouse
3.	Homepage includes basic instructions on how to navigate the site
4.	Text is black on light colored background
5.	Primary navigation menu (or table of contents) is on left panel of page
6.	Navigation buttons are obvious—button is labeled and font size is large
7.	Site map is available on web site
8.	Site map looks similar to table of contents
9.	Important topic information appears at top of page
10.	Descriptive headings provide cues about page organization
11.	Scrolling for important content is not required
12.	Easy and obvious return to homepage from any other page on the web site
13.	Site logo is repeated on every page
14.	Web site contains no more than two layers
15.	Each page provides feedback so user knows where they are
16.	Links are represented as text (rather than image)
17.	Newly opened windows occupies no more than half of the screen
18.	Windows for links have prominent control to close
19.	Use of movement to draw attention does not last more than a few seconds
20.	Image or a video loading time is less than 10 seconds