- From: Kynn Bartlett <kynn-hwg@idyllmtn.com>
- Date: Tue, 26 Oct 1999 15:19:09 -0700
- To: Scott Luebking <phoenixl@netcom.com>
- Cc: W3c-wai-ig@w3.org
At 02:11 PM 10/26/1999 -0700, Scott Luebking wrote: >PS I've been working on a web-based system using sound navigation to >help teach blind chemistry students about different chemical models. It >works with IE4/5 and JAWS, but relies on IE 4/5 features. Is it >accessible or not? Something is accessible if it can be used by users with disabilities. This is can be used by those users -- therefore it is accessible to them. For every thing we put up, there are two sets. If I could draw reliable diagrams I would graph it. In one set we have "all possible users of this application." A smaller subset of that group is "users of this application who can't use it." ( users ( who can't use it ) ) Our goal is to reduce the smaller set to nothingness. When we talk about making something more accessible, we are really talking about shrinking that smaller group. A change which decreases that group by any amount makes the application more accessible. If we are talking about the Internet as a whole, we have: GROUP 1: Potential Users Group 1 includes everyone with access to something that can speak HTTP and retrieve our web pages. This is a big group. GROUP 2: Users who can't use our Internet web page The size of group 2 depends on how we have created our application. Our goal is to minimize this subset of Group 1. By my way of thinking, we are NEVER going to be able to have "perfect accessibility" within the group of Group 1 -- that would mean that Group 2 becomes nothing, and that's not reasonable over a set of 180 million users. Our goal instead is to MINIMIZE the size of Group 2 by making it usable by as many people as possible. Now, let's look at an intranet: GROUP 1: Potential Users The people in our company. This is a finite number, be it 8 or 800. GROUP 2: Users who can't use our intranet application This is a subset of the number above. We _can_ achieve this goal, because we can control what browsers are used, and we can find the small(er) number of users with disabilities and design valid workaround for all of them. Finally, let's look at your chemistry application: GROUP 1: Potential users Blind students of chemistry. GROUP 2: Users who can't use the chemistry program Well, if you do it right, they can all use it. So the size of this set becomes zero. Therefore, over the group of your users, the application _is_ accessible. -- Kynn Bartlett <kynn@hwg.org> President, Governing Board Member HTML Writers Guild <URL:http://www.hwg.org> Director, Accessible Web Authoring Resources and Education Center <URL:http://aware.hwg.org/>
Received on Tuesday, 26 October 1999 18:29:26 UTC