Universal Design is the design and composition of an environment so that it can be accessed, understood and used to the greatest extent possible by all people regardless of their age, size, ability or disability. An environment (or any building, product, or service in that environment) should be designed to meet the needs of all people who wish to use it. - National Disability Authority
Universal Design is usually a checklist to make an environment accessible. However, as Jay Dolmage points out, universal design started off as a verb; it is an action and a world view (2017, p.116). While a list is a good place to start; universal design is a goal with multiple possibilities, multiple processes, and a moving finish line. A checklist doesn't always make you think of the aspects around each part of accessibility. For example, if there are stairs, an easy solution is to make a ramp. However, you also need to consider if the doorway to the building is even accessible.
The 7 Principles of Universal Design are to guide the design of environments, products and communications. They can be used to evaluate designs, guide the design process, and educate both the designers and users.
Principle 1: Equitable Use
The design is useful and marketable to people with diverse abilities.
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Principle 2: Flexibility in Use
The design accommodates a wide range of individual preferences and abilities
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Principle 3: Simple and Intuitive Use
Use of design is easy to understand, regardless of the user's experience, knowledge, language skills, or concentration level.
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Principle 4: Perceptible Information
The design communicates necessary information effectively to the user, regardless of ambient conditions or the user's sensory abilities
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Principle 5: Tolerance for Error
The design minimizes hazards and the adverse consequences of accidental or unintended actions.
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Principle 6: Low Physical Effort
The design can be used efficiently and comfortably and with a minimum of fatigue
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Principle 7: Size and Space for Approach and Use
Appropriate size and space is provided for approach, reach, manipulation, and use regardless of user's body size, posture, or mobility
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