April 2002
"The power of the Web is in its universality. Access by everyone
regardless of disability is an essential aspect."
-- Tim Berners-Lee, W3C Director and inventor of the World Wide Web
Boston, MA -- Imagine a building with stairs at every entrance.
Most people take coming and going for granted, but someone with
limited
mobility sees the building as a fortress. When the owners add
ramps to the building, it turns out that everyone likes them.
The building
becomes accessible to people in wheelchairs, baby strollers,
bikes, delivery carts, and a host of other mobility devices.
Entrance becomes
device independent.
"Too many web sites are built like buildings without ramps," according
Judy Brewer. As Director of the Web Accessibility Initiative
(WAI) (http://www.w3.org/WAI/) for the World Wide Web Consortium
(W3C),
she is trying to raise awareness about improving web accessibility
among information architects, software developers and users.
To this end, WAI coordinates technology developments, guidelines,
tools,
education and outreach, and research and development of organizations
worldwide.
New and Improved for All
For people with poor vision or hearing, physical immobility,
or cognitive or neurological disabilities, the Web offers new
freedom to communicate
and access information. However, complicated image map navigation,
vague text, and other design elements can stump text readers
and other assistive technology.
"People inadvertently create barriers," says Brewer. "People
are not aware of how to make it accessible. They forget to
add descriptions of images and captions of audio, and to mark up
tables and frames
properly so that they can be read by screen readers."
When software developers and web site architects adopt accessibility
strategies, the resulting sites become device independent.
Not only do the strategies include people with disabilities,
but
open up content
to many different user devices such as PDAs, kiosks and mobile
phones.
Unexpected Limitations
As educational web sites proliferate for classroom use and
to communicate with parents, they should be open to all.
A few measures
can ensure
that everyone has access: a student who needs their homework
assignment, a parent who wants information about a fieldtrip,
or a community
member eager to volunteer.
According to Larry Goldberg, Director of Media Access at
the WGBH National Center for Accessible Media (http://ncam.wgbh.org): "What's
essential is that mainstream technologies support accessibility.
Sometimes the technology can be used without any changes
or assistive technology (AT). This is 'native accessibility'.
Sometimes AT
tools such as screen readers or voice recognition software
are needed
to access a web page or browser."
Opening the Door
"
It's not technical, it's human," says Goldberg. "It's
getting people to understand that there is a problem and there
are solutions."
The WAI quick tips list (http://www.w3.org/WAI/References/QuickTips/)
of ten items includes: use the alt attribute to describe
images and animations; provide descriptions and transcriptions
of
audio and
video; and use headings and consistent structure. The site
also includes evaluation tools and more detailed guidelines.
These
changes will
help make a page available to the visually impaired, the
hearing impaired, people who cannot move their hands, people
with cognitive
disabilities or developmental disabilities, as well as a
host of new and yet to be developed access tools for all
users.
"You don't need to take a site that has complex ideas and
make it less so," Brewer says. "You make sure that it
is not more complex then it should be. You simplify the language
and
make navigation
consistent. You can replace vague text such as 'click here'
with more specific text. And these changes benefit all users."
Resources for Teachers
Many educators use Learning Object Repositories for content
to create lesson plans. These web sites are like file folders
of
worksheets,
organized by subject matter, grade level and other criteria.
Teachers can check out a learning object, adapt it for
use in their classroom,
and then return it with a record of the changes made. The
repositories have become learning communities with a knowledge
base of useful
content.
The Adaptive Technology Resource Centre at the University
of Toronto (http://www.utoronto.ca//atrc/) is developing
the Barrier
Free repository.
It requires that the content and structure be separate
from the presentation. If this is done the same content
can be
presented in many different
ways depending on the needs of the learner and the learner
can
navigate through the structure in the manner that best
suits their learning
goals.
Improve the Authoring Tools
The Authoring Tools Guidelines Working Group of WAI takes
a step back from content creation to look at development
tools.
Working
Group members from academia, industry and non-profit organizations
have defined techniques, recommendations and evaluation
tools available at http://www.w3.org/WAI/AU/.
"The most powerful place to effect web accessibility is through
the developers," says Jutta Treviranus, Director of the Adaptive
Technology Research Center, University of Toronto, and
Chair of the W3 Consortium Authoring Tools Guidelines Working Group. "Guidelines
still require people to know about them. The authoring
tools could prompt for the appropriate markup."
The opportunity to publish on the Web offers people with
disabilities new freedoms and opportunities. The Working
Group ensures that
the developers also consider access for people with
disabilities in the
interface of their tools. The next challenge for the
group is dynamic web sites. Server templates, scripts,
and learning
management
systems
need an evaluation and repair structure to make content
from many sources accessible.
Reaching a Wider Audience
Through her work with companies and content creators
around the world, Judy Brewer finds that when people
become aware
of the
problem, they
want to improve their Web sites. They recognize that
the adoption of these strategies is a best practice
that enlarges
their
market. By making content device independent, they
broaden their audience
to include people with disabilities and users of
new technology.
In addition, accessibility laws increasingly address
technology and information access. Forward-thinking
companies have
products ready
for the entire market. Finally, many companies
see adoption of accessibility an opportunity to show
leadership in
social responsibility. |