Accessibility is a general term used to describe the degree to which a product (e.g., device, service, environment) is accessible by as many people as possible. Accessibility can be viewed as the "ability to access" the functionality, and possible benefit, of some system or entity. Accessibility is often used to focus on people with disabilities and their right of access to entities, often through use of assistive technology. Several definitions of accessibility refer directly to access-based individual rights laws and regulations. Products or services designed to meet these regulations are often termed Easy Access or Accessible.
Accessibility is not to be confused with usability which is used to describe the extent to which a product (e.g., device, service, environment) can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use.
Accessibility is strongly related to universal design when the approach involves "direct access." This is about making things accessible to all people (whether they have a disability or not). However, products marketed as having benefited from a Universal Design process are often actually the same devices customized specifically for use by people with disabilities. An alternative is to provide "indirect access" by having the entity support the use of a person's assistive technology to achieve access (e.g., screen reader).
While it is often used to describe facilities or amenities to assist people with disabilities, as in "wheelchair accessible", the term can extend to Braille signage, wheelchair ramps, elevators, audio signals at pedestrian crossings, walkway contours, website design, and so on.
Various countries have legislation requiring physical accessibility which are (in order of enactment):
In transportation, accessibility refers to the ease of reaching destinations. People who are in places that are highly accessible can reach many other activities or destinations quickly, people in inaccessible places can reach many fewer places in the same amount of time.
A measure that is often used is to measure accessibility in a traffic analysis zone i is:
Automobile accessibility also refers to ease of use by disabled people.
In the United Kingdom, the Department for Transport have mandated that each local authority produce an Accessibility Plan that is incorporated in their Local Transport Plan. An Accessibility Plan sets out how each local authority plans to improve access to employment, learning, health care, food shops and other services of local importance, particularly for disadvantaged groups and areas. Accessibility targets are defined in the accessibility plans, these are often the distance or time to access services by different modes of transport including walking, cycling and public transport.
Accessibility Planning was introduced as a result of the report " Making the Connections: Final Report on Transport and Social Exclusion". This report was the result of research carried out by the Social Exclusion Unit.
Low floor in the vehicular sense is normally combined in a conceptual meaning with normal pedestrian access from a standard kerb height. However, the accessibility of a low floor vehicle can also be utilised from slightly raising portions of kerb at bus stops, or through use of level boarding bus rapid transit 'stations' or tram stops. The combination of access from a kerb was the technological development of the 1990s, as step free interior layouts for buses had existed in some cases for decades, with entrance steps being introduced as chassis designs and overall height regulations changed.
Most existing and new housing, even in the wealthiest nations, lack basic accessibility features unless the designated, immediate occupant of a home currently has a disability. However, there are some initiatives to change typical residential practices so that new homes incorporate basic access features such as zero-step entries and door widths adequate for wheelchairs to pass through.
Great Britain applies the most widespread application of home access to date. In 1999, Parliament passed Section M, an amendment to residential building regulations requiring basic access in all new homes. ("Doors to Be Swept Away in New Rules for Builders", Rachel Kelley, The Times, December 5, 1997.) In the United States, the 1988 Amendments to the Fair Housing Act added people with disabilities, as well as familial status, to the classes already protected by law from discrimination (race, color, sex, religion and country of origin). Among the protection for people with disabilities in the 1988 Amendments are seven construction requirements for all multifamily buildings of more than four units first occupied after March 13, 1991. These seven requirements are as follows:
(From Fair Housing First, a website sponsored by the U.S. Department of Housing and Urban Development).
In spite of these advancements, the housing types where most people in the United States reside --single-family homes--are not covered by the Americans with Disabilities Act, the Fair Housing Act, or any other federal law with the exception of the small percentage of publicly-funded homes impacted by Section 504 of the Rehabilitation Act. As a result, the great majority of new single-family homes replicate the barriers in existing homes.
The broad concept of Universal Design is relevant to housing, as it is to all aspects of the built environment. Furthermore, a Visitability movement begun by grass roots disability advocates in the 1980s focuses specifically on changing construction practices in new housing. This movement, a network of interested people working in their locales, works on educating, passing laws, and spurring voluntary home access initiatives with the intention that basic access become a routine part of new home construction.
Another dimension of accessibility is the ability to access information and services by minimizing the barriers of distance and cost as well as the usability of the interface. In many countries this has led to initiatives, laws and regulations that aim toward providing universal access to the internet and to phone systems at reasonable cost to citizens.
Currently there are a few major movements to coordinate a set of guidelines for accessibility for the web. The first and most well known is The Web Accessibility Initiative (WAI), which is part of the World Wide Web Consortium (W3C). This organization developed the Web Content Accessibility Guidelines (WCAG) 1.0 which explains how to make Web content accessible to people with disabilities. Web "content" generally refers to the information in a Web page or Web application, including text, images, forms, sounds, and such. (More specific definitions are available in the WCAG documents.)
The WCAG is separated into 3 levels of compliance, A, AA and AAA. Each level requires a stricter set of conformance guidelines, such as different versions of HTML (Transitional vs Strict) and other techniques that need to be incorporated into your code before accomplishing validation. Online tools such as the Watchfire WebXACT engine or the imergo Web Compliance Manager will allow users to submit their website and automatically run it through the WCAG guidelines and produce a report, stating whether or not they conform to each level of compliance. Adobe Dreamweaver also offers plugins which allow web developers to test these guidelines on their work from within the program.
Another source of web accessibility guidance comes from the US government. Section 508 of the US Rehabilitation Act is a comprehensive set of rules designed to help web designers make their sites accessible. They have also developed a website where you can take online training course for free to learn about these rules. 508 Universe
In general, for a website to comply with accessibility standards, they should at least have the following:
Another good idea is for websites to include a web accessibility statement on the site. This page details the accessible status of the page, lists access keys and can display which validations have been achieved for the site as well as include their pledge for accessibility. Example of a accessibility statement
To ensure these new tests generate results that permit valid inferences about student performance, they must be accessible to as many individuals as possible. The Test Accessibility and Modification Inventory (TAMI) was developed for this purpose. Integrating principles of universal design, assessment accessibility, cognitive load theory, and research on item-writing and test development, the TAMI is a decision-making tool designed to facilitate a comprehensive analysis of tests and test items to enhance their accessibility for all students. The TAMI is a non-commercial instrument that has been made available to all state assessment directors and testing companies.