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The Principles of Universal Design

Universal design refers
to the design of products, environments, programs and services to be usable by all people of different ages and abilities over time, to the greatest extent possible, without the need for adaptation or specialised design.

The
7 Principles of Universal Design were developed in 1997 by a working group of architects, product designers, engineers and environmental design researchers. The purpose of the Principles is to guide the design of environments, products and communications.

PRINCIPLE ONE: Equitable Use

The
design is useful and marketable to people with diverse abilities.
Guidelines:
1a.
Provide the same means of use for all users: identical whenever possible; equivalent when not.
1b.
Avoid segregating or stigmatizing any users.
1c.
Provisions for privacy, security, and safety should be equally available to all users.
1d.
Make the design appealing to all users.

PRINCIPLE TWO: Flexibility
in Use

The
design accommodates a wide range of individual preferences and abilities.
Guidelines:
2a.
Provide choice in methods of use.
2b.
Accommodate right- or left-handed access and use.
2c.
Facilitate the user's accuracy and precision.
2d.
Provide adaptability to the user's pace.

PRINCIPLE
THREE: Simple and Intuitive Use

Use
of the design is easy to understand, regardless of the user's experience, knowledge, language skills, or current concentration level.
Guidelines:
3a.
Eliminate unnecessary complexity.
3b.
Be consistent with user expectations and intuition.
3c.
Accommodate a wide range of literacy and language skills.
3d.
Arrange information consistent with its importance.
3e.
Provide effective prompting and feedback during and after task completion.

PRINCIPLE FOUR: Perceptible
Information

The
design communicates necessary information effectively to the user, regardless of ambient conditions or the user's sensory abilities.
Guidelines:
4a.
Use different modes (pictorial, verbal, tactile) for redundant presentation of essential information.
4b.
Provide adequate contrast between essential information and its surroundings.
4c.
Maximize "legibility" of essential information.
4d.
Differentiate elements in ways that can be described (i.e., make it easy to give instructions or directions).
4e.
Provide compatibility with a variety of techniques or devices used by people with sensory limitations.

PRINCIPLE FIVE: Tolerance for Error

The
design minimizes hazards and the adverse consequences of accidental or unintended actions.
Guidelines:
5a.
Arrange elements to minimize hazards and errors: most used elements, most accessible; hazardous elements eliminated, isolated, or shielded.
5b.
Provide warnings of hazards and errors.
5c.
Provide fail safe features.
5d.
Discourage unconscious action in tasks that require vigilance.

PRINCIPLE SIX:
Low Physical Effort

The
design can be used efficiently and comfortably and with a minimum of fatigue.
Guidelines:
6a.
Allow user to maintain a neutral body position.
6b.
Use reasonable operating forces.
6c.
Minimize repetitive actions.
6d.
Minimize sustained physical effort.

PRINCIPLE SEVEN:
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. Guidelines:
7a.
Provide a clear line of sight to important elements for any seated or standing user.
7b.
Make reach to all components comfortable for any seated or standing user.
7c.
Accommodate variations in hand and grip size.
7d.
Provide adequate space for the use of assistive devices or personal assistance.

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