The difference between accessibility and usability is easily confused, not obviously clear and seems to overlap. Get your tea or coffee ready because we are here to help!
What is accessibility?
Accessibility is mainly to do with what categories of people can or cannot access communication, products, services or buildings. And what devices, software or products they may use to help them. For example, people with vision impairments, or who are ageing, or have dyslexia, or have physical disabilities, have certain needs and specific requirements, to be able to access things as easily as everyone else. There are also things called access structures (Waller, 1979), which are not to do with different people’s needs, however, they allow better and more customisable access to communication, products, services and buildings.
Examples of accessibility
An accessible website
Websites can have extra description, like to describe the content of photographs, and extra tags put into the code of website to better describe the content and allow screenreaders (software that reads-out webpages in an audio form for people with vision impairments), to help them better understand the webpage. If the person’s vision impairment is not great, they may not be able to depict and decipher the content and things inside the photograph, so how would they be able to read the photograph? Well, alt tags can be used to describe the image in a text form, that can then be read-out in audio form, using screenreader software.
In the area of graphic communication design, things like: a search option on a website, or an index in the back of a book, or a contents page at the front of a publication, allow better access to the information. Even simple heading levels like heading 1, heading 2 and heading 3, allow much better access into information. Imagine if the information was one large block of text with no indents, headings, punctuation or paragraph spaces, how easy would it be to use then..?
Yes access structures increase and improve usability, however, they are more directed at allowing better access to information.
Accessibility and laws
Since 2010, there have been great improvements, interest and new laws introduced around accessibility issues. Here are 2 links to more information about accessibility laws:
- The Law and requirements webpage by The Plain Language Action and Information Network. The Plain Writing Act of 2010 in America, was signed on the 13th October 2010 and requires federal agencies to use clear government communication that the public can understand and use.
- The Web accessibility laws and policies webpage by the W3C (World Wide Web Consortium) Web Accessibility Initiative (WAI). The webpage lists accessibility laws throughout the world.
Personal experiences of bad accessibility
An example that you may have experienced personally, is better access to public buildings through wider entrances, lifts and larger open-door buttons at waist height, so if people are using a wheelchair, or have a physical disability, or are using a vision impairment stick, they can do what they need to, just like anyone else. Just because some people might be less able than what is typical, does not mean they have to suffer…
What is usability?
Usability is the actual using and interaction with the communication, product, service, or building. It is more to do with whether people can or cannot do what they need to, or accomplish tasks. More specifically, usability experts and usability testers make a note of and analyse usability errors, and then fix them, to remove barriers and difficulties, to improve usability.
Examples of usability
The graphic communication design of a webpage
Not being able to find typically needed and basic information
Maybe you were using a webpage or reading a monthly utility bill, and you could not find a telephone number or email address that you needed to clear-up a question you had? Or it could be that you cannot find an option to change a setting on your smartphone, because you are lost in submenus, and subsequently cannot do what you intended to do.
Plain English assumptions and guarantees… A plain English description of plain English is hard to find…
As an example, if I said to you ‘what is the size of the image you need for the website’, and then you replied ‘190 × 260’. This may sound fine, however, there are a few usability issues with this. 1st which of the 2 measurements is the width and which is the height? In the United Kingdom it is standard practice to say the width measurement value 1st, then the height measurements value 2nd, however this is certainly not an precise assumption, and in America, their standard practice is the opposite way round. Then, what is the measurement value of the 2 numbers, is it cm’s, mm’s, inch’s, pica’s, point’s, or pixel’s? If you were a manufacturer of DIY (do it yourself) materials, what would happen if you supplied measurement information this way in your catalogue or on your website… Issues like this are surprisingly common, and encountered on a daily basis by millions of people.
Another example could be the following 190–260 units. So editors, graphic communications designers or people who work with information on a daily basis would know that the en dash (the long minus like sign inbetween the 2 number values) stands for the word to, however using this formatting for people who do not work with text or graphic communication, or who have a low level of literacy, they will have no idea about how to interpret this value (GOV UK, 2016). It could even communicate to some people, the mathematical minus sign 190 - 260 (190 minus 260)… It is part of accessibility and usability to find out and foresee issues like this, as they can do a lot of damage to communication and take-up more time and effort than is usual for people.
How important are accessibility and usability, and what are their effects?
Accessibility and usability are as important as every other aspect of your communications, products, services, or buildings, even equally as important as how beautiful the design is (aesthetics, beauty) which gets the most time and attention in design projects. If different types of people cannot access your communication, products, services, or buildings, they will probably reject it and turn away, and then your communication has excluded them. Those people may even be potential customers or services users… which makes customers who are not using you, and creates lost sales.
Usability is the whole bowls of design and communication, if something looks good, but you cannot read it or understand it, then what? Small subtle not obvious changes in layout, colours, text, wording and technical aspects, have a huge impact on accessibility and usability.
Then there is the issue of the increased time and stress for people, if things are not accessible and usable, it wastes people’s time and increases stress, and damages the user’s experience of your service or brand.
Accessibility has received great interest on the web by website designers, and in buildings for regular public use, and in general since 2010. The web is a very open medium and everyone should be able to enjoy it, it is what the internet is about, and to exclude and create barriers to web content, goes against what it for and about, at its core. Accessibility and usability are critical factors that make-up what good design is.
Would you like to know more about accessibility and usability?
In almost all of our projects on this website, we have improved accessibility and usability issues and problems, improving the client’s communication massively. If you have a browse around our website, in the yellow navigation menu at the top of webpages, see the Book design, Journal design, Information design, Publication design, and Redrawing sections, and some of the projects have a before our redesign image, and after our redesign image.
Find out more about accessibility
- W3C (World Wide Web Consortium) Web Accessibility Initiative (WAI) accessibility principles they produce guidelines, advice and set standards for best practice when designing accessible websites. The webpage has good examples of website design accessibility problems and issues, outlines why the issue needs to be addressed, and then tells you how to fix it.
- Information on different types of people for graphic communication, website and information designers which includes a freely reusable infographic. This is a research and statistical research paper written by us, which includes a very handy freely reusable infographic, ideal for using on website accessibility statements.
- Inclusive Design Toolkit by the University of Cambridge, UK. A great outline and introduction into inclusive design, with many interesting features and insights. For more inclusive design resources see also the University of Cambridge Engineering Design Centre website.
Find out more about usability
- Usability.gov a leading resource for user experience (UX) best practices and guidelines, serving practitioners and students in the government and private sectors. Content for this site is managed by the Digital.gov team in the U.S. General Services Administration (GSA) Technology Transformation Service.
- Information Design Journal is a peer-reviewed international journal that bridges the gap between research and practice in information design. Started in 1979 it publishes world-class academic papers, interviews and other pieces on information design issues.
- Nielsen Norman Group research-based user experience organisation, they write articles, conduct studies, present before and after case studies, and arrange worldwide conferences, showing usability problems and improvements.
Connected terminologies and areas around accessibility and usability
Design for all
The design of products, services and systems for as many people as possible, without the need for extra aids.
Reduce human error, increase productivity, and enhance safety and comfort with a specific focus on the interaction, between the human and the thing of interest.
Aims to remove the barriers that exclude people. Design is used to enable everyone to participate equally, confidently and independently in everyday activities.
Plain English and clear language
Clear and easy-to-understand writing and information.
The design of buildings, products or environments to make them accessible to all people, regardless of age, disability or other factors.
An iterative design process in which designers focus on the users and their needs, in each phase of the design process.
How a user interacts with and experiences a product, system or service.
Accessibility and usability issues are critical to your communications. Their importance has been gaining massive wide-spread value and momentum, especially since 2010. You can only go so far using your own understanding, you need access to experts like us, and to test with users (the people you are actually designing for). You are not the only one using the communication, product, service or building.
Any tea or coffee left? We can help you substantially decrease the complexity, time and difficulty of designing information that works well for a wide range of people. There is no need to be scared… contact us!