1.3.2. Design Goals

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

Design Goals: • Avoid segregation or stigmatization of any users. • Provide the same means of use for all users — identical whenever possible; equivalent when not. • Ensure privacy, security, and safety are equally available to all users.

Examples in Civil Engineering: • Automatic doors at entrances allow both people with disabilities and able-bodied individuals to enter without assistance. • Digital pedestrian signals with audio and visual outputs benefit both visually impaired and hearing-impaired users. • Multi-height counters in public buildings or customer service points that serve people in wheelchairs as well as standing individuals.

Equitable Use focuses on ensuring that all users, regardless of their abilities, can access and utilize a design or environment effectively. The three main goals here are to eliminate any form of segregation, to provide equal usability for all users, and to ensure safety and privacy universally. For example, automatic doors provide the same access to both individuals using wheelchairs and those who do not need assistance. Similarly, digital signals that provide audio cues help both visually and hearing-impaired individuals navigate safely.

Imagine a restaurant where the entrance has steps. Only able-bodied individuals can enter easily, while those using wheelchairs or crutches would struggle. Equitable Use ensures there's an automatic door, allowing everyone to enter without feeling left out or stigmatized. This is like a bridge that everyone can walk over, regardless of their speed or style of walking.

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

Design Goals: • Provide choice in methods of use. • Accommodate right- or left-handed access and use. • Facilitate user accuracy and precision. • Adapt to the user’s pace.

Examples in Civil Engineering: • ATM machines with tactile keypads, audio outputs, and adjustable screen angles. • Staircases with handrails on both sides to support left and right-handed individuals or people with reduced grip. • Adjustable lighting in public spaces that helps individuals with varying degrees of visual sensitivity.

Flexibility in Use means that a design can cater to different user preferences and needs. This includes offering various methods to use an object and accommodating different hand dominance. The design should enhance the user's ability through features that allow them to proceed at their own pace. For instance, ATM machines with multiple access options make it easier for users with diverse abilities to interact.

Think about a kitchen where both tall and short people can cook comfortably. Adjustable counters, or a mix of tools that can be used with either hand, make cooking easier for everyone. This is like a flexible pair of shoes that can fit different foot shapes and sizes — everyone gets to walk comfortably!

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

Design Goals: • Eliminate unnecessary complexity. • Be consistent with user expectations and intuition. • Accommodate a wide range of literacy and language skills. • Provide feedback to the user.

Examples in Civil Engineering: • Pictograms on signage that convey messages universally (e.g., restrooms, exits, emergency information). • One-touch pedestrian crossing buttons with LED feedback. • Color-coded and labeled floor plans in buildings for easy navigation.

Simple and Intuitive Use emphasizes making designs easy to understand, no matter the user's background or knowledge level. This means simplifying the design, aligning it with what users expect, and offering feedback. For example, using symbols on signs instead of just words makes it easier for everyone, including those who might not read the language well.

Imagine teaching someone how to use a new app. If the app has clear icons and uses simple words, it becomes easier to navigate. It's like a map with pictures for landmarks instead of complicated street names; anyone can find their way around!

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

Design Goals: • Use different modes (pictorial, verbal, tactile) for redundant presentation of essential information. • Provide adequate contrast between essential information and surroundings. • Maximize legibility of essential information. • Differentiate elements in ways that can be described (i.e., make it easy to give instructions or directions).

Examples in Civil Engineering: • Tactile paving on footpaths and at pedestrian crossings for visually impaired individuals. • Emergency evacuation signs that include both audio alarms and flashing lights. • Contrasting colors and textures on stairs and walkways to enhance visibility for the elderly or visually impaired.

Perceptible Information ensures that all essential information is communicated effectively through different methods that cater to various sensory capabilities. This includes visual, tactile, and auditory information. For example, tactile paving offers guidance to visually impaired individuals, while contrasting colors help different users recognize important features.

Consider a bakery that uses both written menus and pictures of each cake. Whether you can read the menu or not, you can still choose what you want by looking at the pictures. It's like how some songs have lyrics printed in large letters alongside the music video to help everyone enjoy the performance.

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

Design Goals: • Arrange elements to minimize hazards and errors. • Provide warnings of hazards and errors. • Provide fail-safe features. • Discourage unconscious action in tasks that require vigilance.

Examples in Civil Engineering: • Railings and barriers on elevated walkways or balconies to prevent falls. • Non-slip surfaces in wet areas such as bathrooms and swimming pool zones. • Gradual curbs and ramps with tactile warning strips near vehicular roads.

Tolerance for Error relates to designing environments that reduce the chances of mistakes and their consequences. This means strategically placing features to prevent accidents (like railings) and ensuring there are warning signs to help users stay safe. For example, non-slip flooring in public bathrooms can significantly reduce slips and falls.

Imagine a car with advanced safety features that warn you before you accidentally cross into another lane. Just like that, designs with Tolerance for Error work to keep people safe by anticipating potential mistakes before they happen, like a safety net for acrobats.

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

Design Goals: • Allow user to maintain a neutral body position. • Use reasonable operating forces. • Minimize repetitive actions. • Minimize sustained physical effort.

Examples in Civil Engineering: • Lever-style door handles instead of round knobs, which require less grip strength. • Push-button elevators placed at accessible heights. • Public washbasins with motion sensor faucets.

Low Physical Effort focuses on ensuring that using a design does not tire the user out unnecessarily. This involves making the operation easy and requiring minimal physical exertion. For instance, lever-style door handles are easier to use than round knobs, especially for individuals with limited strength.

Think about carrying heavy bags. If you're given a wheeled cart to help, it becomes much easier to move things around without exhausting yourself. Similarly, designs that minimize physical effort make everyday tasks effortless and accessible for everyone, like rolling luggage compared to carrying it!

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

Design Goals: • Provide a clear line of sight to important elements for any seated or standing user. • Make reach to all components comfortable for all users. • Accommodate variations in hand and grip size. • Provide adequate space for assistive devices or personal assistance.

Examples in Civil Engineering: • Wide doorways and corridors to accommodate wheelchairs and mobility aids. • Accessible parking spaces with adjacent access aisles. • Restrooms with turning space for wheelchairs and grab bars for assistance.

Size and Space for Approach and Use ensures that the physical environment has suitable dimensions, allowing everyone, regardless of their physical condition, to navigate and use the space comfortably. This includes features like wide doorways for wheelchair users and ample space in restrooms to accommodate assistance devices without hindrance.

Imagine trying to fit a large piece of furniture through a narrow doorway — it just won't work! Designs that prioritize adequate size and space allow everyone to move effortlessly, like a spacious hallway in a museum that lets visitors freely explore without bumping into each other.

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