Article

The Web Accessibility Quantitative Metric (WAQM) aims at accurately measuring the
accessibility of web pages. One of the main features of WAQM among others is that
it is evaluation tool independent for ranking and accessibility monitoring
scenarios. This article proposes a method to attain evaluation tool independence
for all foreseeable scenarios. After demonstrating that homepages have a more
similar error profile than any other web page in a given web site, 15 homepages
were measured with 10,000 different values of WAQM parameters using EvalAccess
and LIFT, two automatic evaluation tools for accessibility. A similar procedure
was followed with random pages and with several test files obtaining several
tuples that minimise the difference between both tools. One thousand four hundred
forty-nine web pages from 15 web sites were measured with these tuples and those
values that minimised the difference between the tools were selected. Once the
WAQM was tuned, the accessibility of 15 web sites was measured with two metrics
for web sites, concluding that even if similar values can be produced, obtaining
the same scores is undesirable since evaluation tools behave in a different way.

Langue : ANGLAIS