8.2. The Seven Principles of Universal Design

Definition: The design is useful and marketable to people with diverse abilities. Key Features:

• Provides the same means of use for all users.
• Avoids segregating or stigmatizing any users.
• Provisions for privacy, security, and safety are equally available to all. Example: A building entrance with an automatic sliding door that serves everyone equally, without a separate door for wheelchair users.

Equitable use means that everyone can access and use a design or environment, regardless of their abilities. This principle emphasizes that designs should not isolate or stigmatize any group of users. For instance, all users should have the same way to enter a building without feeling different or separate. If a building provides an automatic sliding door, everyone—including those with mobility issues—can use it without facing barriers.

Think about a restaurant with an accessible entrance. Instead of having stairs that some customers can’t use, they have a ramp. This ramp allows everyone, whether they are on foot, in a wheelchair, or pushing a stroller, to enter easily and enjoy their meal together. The design does not differentiate between users but welcomes all equally.

Definition: The design accommodates a wide range of individual preferences and abilities. Key Features:

• Provides choice in methods of use.
• Accommodates right- or left-handed access and use.
• Facilitates user's accuracy and precision. Example: A classroom with movable furniture that allows students with and without disabilities to customize their workspace.

Flexibility in use means that a design can adapt to different needs and preferences. This is important because people learn and work in various ways. For example, if furniture in a classroom can be rearranged, it allows all students to arrange their space in a way that works best for them, whether they are right-handed or need to work standing up or sitting down.

Imagine a kitchen where all the cabinets can be configured differently. This allows someone shorter or in a wheelchair to adjust the height of shelves to their liking. Just like a kitchen, flexible spaces allow each person to customize their environment to better fit their needs and improve their experience.

Definition: Use of the design is easy to understand, regardless of the user's experience, knowledge, language skills, or concentration level. Key Features:

• Eliminates unnecessary complexity.
• Accommodates a wide range of literacy and language levels.
• Provides clear and consistent cues. Example: A public kiosk with touch screen icons and audio feedback for navigation by persons with low literacy or visual impairment.

This principle focuses on making designs clear and straightforward. Complexity can confuse users, especially if they have different backgrounds or abilities. For example, a simple kiosk with easy-to-understand icons and audio cues ensures that everyone, from children to the elderly, can use it effectively without frustration.

Consider a remote control for a TV. If it has too many buttons and complicated symbols, a person might struggle to figure out how to operate it. But if it has a few large buttons with clear icons (like a play button, pause button, and volume control), anyone can easily understand how to use it—just like a friendly guide showing the way.

Definition: The design communicates necessary information effectively to the user, regardless of ambient conditions or the user's sensory abilities. Key Features:

• Uses different modes (pictorial, verbal, tactile) for redundant presentation of essential information.
• Provides adequate contrast between essential information and its surroundings.
• Maximizes legibility of essential information. Example: Emergency alarms that use both flashing lights and sound to alert people with hearing or visual impairments.

Perceptible information ensures that important messages are accessible to everyone. This is vital in emergency situations where clarity can save lives. By using multiple formats—like sound, lights, and clear signs—a message can reach a broader audience, including those who might have impairments or be in challenging situations.

Think of fire alarms that flash while making sounds. If someone can't hear the alarm, the bright flashing light will still get their attention, alerting them to the danger. Just like in a movie theater where emergency instructions appear on screen while also being verbally announced, this dual approach makes sure everyone understands without relying solely on one method.

Definition: The design minimizes hazards and the adverse consequences of accidental or unintended actions. Key Features:

• Arranges elements to minimize hazards and errors.
• Provides warnings of hazards and errors.
• Allows fail-safe features. Example: Software that provides an “undo” feature or a confirmation prompt before permanently deleting files.

This principle emphasizes safety and reduces the likelihood of mistakes or dangerous situations. By anticipating user errors and creating ways to correct mistakes, designs become more user-friendly and reduce risks. For example, an 'undo' option helps people feel secure in their actions, knowing they can fix errors easily.

Think of using a pen with a mistake-correcting feature—when you make a mistake, you can easily fix it rather than start again. Just like in situations where a bridge has clear warning signs or barriers to prevent accidents, tolerating errors creates a safer environment for everyone.

Definition: The design can be used efficiently and comfortably and with a minimum of fatigue. Key Features:

• Allows user to maintain a neutral body position.
• Uses reasonable operating forces.
• Minimizes repetitive actions and sustained physical effort. Example: Lever-styled door handles that require minimal grip strength compared to traditional round knobs.

This principle focuses on reducing the physical demands placed on users. By creating designs that require minimal effort, we ensure that more people can access and use them comfortably. Features like lever door handles, which can be pushed down rather than turned, are easier for everyone, especially those with strength limitations.

Think of doors in public spaces with push bars instead of round knobs. When you can simply push a bar, it requires less effort than rotating a knob. This is similar to using a shopping cart instead of carrying heavy bags; the cart allows for easier transport without straining.

Definition: Appropriate size and space is provided for approach, reach, manipulation, and use regardless of user's body size, posture, or mobility. Key Features:

• Accommodates people with mobility aids (e.g., wheelchairs, walkers).
• Provides adequate space for seating, standing, or movement.
• Ensures accessibility from both left and right sides. Example: A kitchen layout with counters, switches, and storage reachable by both standing users and those in wheelchairs.

This principle highlights the importance of providing sufficient space for everyone to interact with a design, regardless of their physical abilities or needs. It's about ensuring that layouts and designs consider diverse users, making them accessible without frustration or difficulty.

Imagine a kitchen where a person using a wheelchair can easily roll up to the counter and reach all the necessary tools and appliances. If the space is planned with accessibility in mind—like having wide aisles and lower counters—every person can participate in cooking without encountering barriers, just like a well-designed park with paths easy for cyclists, pedestrians, and strollers alike.

--